he had a black i.s. flag. karim: no muslim, no human being should ever do this -- no matter what his or her background. nobody should be murdered. i'm trying to do the best i can and to lead by example, an example of a good muslim. reporter: mabrouk, who has egyptian roots, is a devout muslim. he prays five times a day. born in vienna, he says life is becoming more difficult for muslims in austria. karim: even as a kid, the fact that i am a muslim was an issue. people would make comments about it. yes, people often give you weird looks, or make you feel unwelcome. we fear things are going to get worse. reporter: now, austria's new political situation is putting anti-radicalization efforts like these in jeopardy. that would lead to more cases like that of emre, who became acquainted with i.s. sympathizers while in jail. emre: i felt the state hated us -- those who've emigrated here, foreigners. so i thought i might as well give them a real reason to hate me. that's what motivated me to get wants to reach kids b