I just came across this thread... I've thought about posting something like this many times... I'm reminded of our exchange over a year ago, not long after you joined the forum:
https://forums.macrumors.com/thread...f-being-on-a-mac.2019399/page-6#post-24026318
I actually
would put a lot of the "fault" on MacRumors - i.e. the way it's moderated. And I'm not saying it's "good" or "bad" moderating - it's simply the way they've decided to run their site, and that's quite literally their
business. The endless arguing leads to more eyeballs = advertising = money. (I can of course make the case for why it's fools gold chasing that, but the world generally doesn't work as it's supposed to

). And since they'll of course reject that reasoning, we could just agree that they run the site that way because they want to.
That being said, the posting "rules" and the way the forum is moderated quite directly leads to all the most knowledgeable, intelligent articulate, thoughtful and
sane posters not wanting to waste their time here, and ceding the forum to the kind of posters you describe.
The thing is, knowledgeable, intelligent, articulate, thoughtful and sane posters don't do the same thing over and over again, expecting different results. They see the results and then move on. Maybe they check back once in a while to see if anything has changed, but they don't just repeat over and over again. Ultimately, that leads to a forum full of people who are the opposite.
We see this spreading throughout the internet. An endless sea of people spouting their opinions with little knowledge, comprehension, context, or perspective. In this internet age we live in, that's what rises to the "top". And the mods on this site don't do much to challenge that.