I am not the actual author, but perhaps he, or someone else, will respond in detail.
What can I say? Everything is the "cause" of something. Son of Sam killed people because he thought a neighbor's dog told him so. People have to judge for themselves whether the "reason" for an action was a justified one.
Just in case your friend, like me, is occasionally humor impaired, I meant "satrically write about," not "write about as justification for their evil deeds."