They suck

Because they're forcing opinions and don't respect their opponents, maybe? 🤔

Being uncivilized.

There usually brainwashed

Desperate times call for desperate measures?

Too much war tools (guns, swords, spiked clubs). Since forever.

I guess frustration plus conviction plus the (more or less) objectification of other people. I've heard that the original sin is to think of other living beings as objects; I can see how that would lead to all imaginable forms of evil.