. >> reporter: yale law school professor stephen carter, author of the book "the violence of peace," agrees that minimizing risk to u.s. troops is a worthy goal. but he says it also has moral implications that should not be ignored. >> when america has troops on the ground and people are dying as well as killing, it's on the news every day. when we're using standoff bombing, when we're using missiles that kill but place no risk, it fades the nation's consciousness. that means it's easier to fight, which means it's more likely we'll fight. >> reporter: notre dame university professor of international law mary ellen o'connell worries that the growing availability of unmanned aerial systems lowers political and psychological barriers to killing. >> these sleek, attractive, small glider like planes fly out of their hanger and slip in to a village somewhere and drop a bomb. that seems so easy to do. and on the screen, it doesn't look any different than the video game that the soldier plays later at her home. >> are these people arguing that we should only fight if you are exposed to threa

>> uh, no. >> stephen: bill, thank you for joining us. willem defoe, "john carter," in theaters this friday. thank you so much. we'll be right back. >> stephen: that's it for "the captioning sponsored by comedy central captioned by media access group at wgbh access.wgbh.org

stephen: not here. [laughter] like most christians, i hold a grudge. now, sir, your new movie is called "john carter." >> yeah. >> stephen: all right. you play a nine-foot-tall alien with four arms. >> that's right. >> stephen: you're a method actor, right? [laughter] how do you prepare far nine-foot-four armed alien? do you a ride along with what? >> it's called motion capture. you get a little help from animators. >> like ping pong balls on your body. >> partly that. also we actually filmed all the scenes because... >> stephen: on mars? >> yeah, utah, mars. >> stephen: hard to tell the difference. [laughter] >> amazingly similar. >> stephen: okay. so did you actually do it in a field with the stuff on your body or were you in a big groan room? >> always on location. the other interesting thing to me anyway was stilts. i had to wear stills to give me the right height. >> stephen: so you were actually wearing... >> which is great. >> stephen: you're ready to play uncle sam in a parade now. think about iment think about it. >> okay. okay. >> stephen: we have a clip of the movie. jim, can we? show the

zbigniew brzezinski, former national security adviser to president jimmy carter and mr. stephen hadley, former national skaurt adviser to president george w. bush. thank you, gentlemen, very much for joining us today. we really do appreciate it. [ applause ] >> this forum could not be more timely. unfortunately could not be more timely. the united states is facing enormous challenges in the united states as the arab awakening continues to change politics in the region. the violence in syria, can i say the butchery in syria, has left the international community should do to end the bloodshed, and the challenges posed by iran's nuclear program have many talking about the prospects of war. let's all hope that does not happen.

carter and alan recorded her. and t bone heard the song and -- >> want to hear a bit. >> stephen: is this what it originally was likeng it, what they did was adapt it they wrote new lyrics and they also did it as a har machine. >> three part har machine. >> we're going to try something here. ♪ what a sleepy little baby ♪ ♪ going to sleep little baby ♪ ♪ your mamma gone away ♪ and your daddy going to stay ♪ ♪ leave nobody but the baby ♪ ♪ (cheers and applause) >> stephen: when we come back we're going to i do a classic american folk song with elvis costello, emmylou >> welcome back, everybody, ladies and gentlemen, i'm proud to present emmylou harris, elvis costello and don fleming. (cheers and applause) ♪ down the road here from me ♪ ♪ where you lay down a dollar or two ♪ ♪ you go around the bend ♪ when you come back again ♪net there's a jugful of mountain dew ♪ ♪ well they call it that old mountain dew ♪ ♪ been there with you ♪ i look all my money ♪ to fill up my jug ♪ with that good old mountain dew ♪ ♪ my old aunt june ♪ bought some new perfume ♪ and it had such a sweet smelling ♪ ♪ but to her surprise ♪ when she

zbigniew brzezinski, former national security advisor to jimmy carter, and mr. stephen hadley, advisor to george w. bush. thank you, gentlemen, very much for joining us today. we really do appreciate it. [applause] >> this forum could not be more timely. i almost could say unfortunately could not be more timely. the u.s. is facing enormous challenges in the middle east. the violence in syria, the butchery in syria, has left many wondering what america and the international community should do to end the bloodshed. the challenges posed by iran's nuclear program have many talking about the prospects of war. let us all hope that does not happen. our guests today are especially suited for it shedding light in the rapidly changing political environment of the middle east. the forum which was sponsored by -- is organized by -- there is deep and cutting edge academic research that includes years of public opinion polls in the arab and israeli world as well as in the united states. that program is releasing results of a new public opinion poll about american public attitudes to

doctor zbigniew brzezinski, former national visor to present jimmy carter, and stephen hadley. thank you, jim for joining us today. we can really do appreciate it. [applause] >> this forum could not be more timely. the united states is facing enormous challenges in the middle east as the arab awakening continues to change politics in the region. the violence in syria, can i say the butchery in syria, has led many to wonder what america and the international community should do to end the bloodshed. at the challenges posed by iran's nuclear program have many talking about the prospects of war. let us all hope that does not happen. our guests today are especially suited for shedding light on america's policies choices in the rapidly changing environment of the middle east. the forum which is sponsored by the college of behavior social sciences is organized by, its holder, supplementing these events is deep and cutting edge academic research that includes use of public opinion polls in the arab world and israel has one of the one in united states. today, the program is releasing r