Edit to add: What's motivating me continuing this discussion is that I feel like you're pushing back on encouraging people from doing better, from improving how they engage with others. I'm not sure if that's really what you intend, so please do elaborate on that point. Clearly this is important to me, so I appreciate that you're taking the time. (Though, with that, I'm signing off fir the night. It's late :)
As an empirical matter, I would note that most threads (both here and on simmilar sites, such as reddit) seem to follow a predictable life-cycle. An initial wave of low quality posts gets down voted and gives way to more thoughtful discussion. In less trolly topics, the "low quality" posts are actually ok, but still give way to much higher quality posts through upvotes.
We can argue about the cause of this lifecycle. I think the general effort calculus I explained above is a part of it. However, I think that often times having low quality posts to respond to can be an effective prompt for high quality posts to respond to; or for a poster to consider why the thoughts expressed in them are wrong, and write a better top level post. Of course, this would be better done with high quality posts, but those take more time.
Put another way, the best way to get a good answer is often to give a bad answer and have people correct you.
edit for your edit:
I am pushing back because: A) I think you initial post is low quality. As such, it has led to (in my opinion) fruitful thinking on my part, and hopefully a fruitfull discussion. and B) Underlying your initial post is, in my opinion, a fundamental misunderstanding of how these threads work. I don't like you insulting everyone who comments on this thread just because you saw the thread at the ugliest part of its lifecylce.
Low effort content that incites a reaction is a hallmark of the upvote system and currently the only thing that I've seen curtail it is human moderation.
