As I told you, it's reached the point where I'm repeating myself. When users repeatedly post flamebait comments that predictably lead to flamewars, we rate limit their accounts (or ban them).
That's not the same thing as saying that "nothing worthy will come out of divisive subjects", because it's still possible to post thoughtfully and substantively about those. I'm not saying it's easy, but it's doable, and that's what we ask of users here. The site guidelines don't say to avoid such topics, they say:
"Comments should get more thoughtful and substantive, not less, as a topic gets more divisive."