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what's more, since port arthur, there has been only one public mass shooting in all of australia. an accounting by "the washingtonelps put this into perspective. by its count in the same period in the u.s., there have been more than 100 such deliberate killings of four or more victims in a public space unrelated to other crimes. that list of course stopped by the las vegas shooting. for the victims of port arthur, painful memories will never be too far away. >> one of the things that affects me most is if we wake up to the radio in the morning and there's been shootings overseas, particularly american, and that really makes us take a step back sort of thing. >> it's almost like what happens in those events is not that far from normal life. it's the cancer that's eating away the united states of america. it is possible to change the way things are. >> up next, after many shootings in america, fingers are pointed to the influence of violent video games. we will visit a country where people are equally obsessed with such games if not more. is gun violence a big problem there? well, you'll find out when we come back.