Speaking of dichotomies, referring to people as "good guys" or "bad guys" is a peeve of mine. Obviously, society should do what it can to prevent people from committing crime or terrorism, even using lethal force when necessary. These "bad guys" don't imagine themselves as evil actors though. They may be wrong or misguided, but most of them are doing what they think is right. To put things in perspective, Martin Luther King was considered a criminal by segregationists and WW2 resistance fighters were considered terrorists by the Nazis. You're never going to win wars on crime or terror by sifting out bad people from good people.
We can't defer to people's judgement of themselves and their intentions. The law and the courts make an independent distinction between legal and illegal.