Most of those threads just go on for too long. It usually goes
1 - person suggests something
2 - people give good counter arguments
3 - OP or people with their opinion respond back
4 - back and forth for a few rounds
5 - people get bored and start to get more and more hyperbolic because why not? no one is changing their mind
6 - it devolves into trolling.

like most forums once the trolling starts, it's too fun to stop. That's why we have a 100+ page thread about dps meters, it's too fun for people to get firemage to reply again and again and bait him over and over.
if you want serious discussion, interact with about the first 5-10 pages of a thread then ignore it.