Absolutely. There are extremists everywhere in life, they fly under many banners, and they justify their violent behaviour by any means.

They often use religion as an excuse to commit atrocities. And then people blame the whole religion, or the whole race, the book, the idea etc instead of holding the individual, him/herself, accountable for their actions.

I don't care what someone believes, what God they choose as theirs, what their sexuality is, who they love. I care about their actions. How they treat others.