Just because you can kill somebody does mean it is the proper way to go with your ideas. We saw that in the Middle Ages's where the biggest bully always one, not the most intelligent or peaceful. Anyone can kill somebody it is the true leader of the people who can use logic to solve problems instead of creating them.
I remeber I used to sit there in debate. When I would listen to these people when we where not debating on their real life ideas. I was always like um, ya if they get a lot of power and their strategy to get that power is to use human bombing and sneak bombing attacks. What do you think will happen if they gain power that way and wish to expand their sharia law to us.