Hm. I guess we can't possibly judge the guy who threw the molotov cocktail. He could have been clearing a wasps nest.

This is a accidentally good example, we don't know what motivated him, while your ridiculous reason is unsound because it would be also a bad thing to do if he were clearing a wasps nest on someone else's property in the middle of the night.

I suspect that they are not a bad person but someone radicalised by the media they consume.

Firebombing someone's house is a bad thing to do. It doesn't mean they are necessarily a bad person. Anger and confusion can make good people do bad things.