Oh, man. That was kind of the end of the line for me, too. I’d get roped into conversations trying to defend the question, which wasn’t even mine, because I thought it was novel and interesting enough to be worth answering in the first place. And then I asked myself what I was doing getting suckered into these talks. I don’t need that kind of tarpit.

Yes. The problem is that the model was questions open by default, so you had exposure to the question before it could be properly be considered for inclusion. The Staging Ground fixed this, but too little (only applied to a small random sampling of questions) and way too late.

It's considered part of your responsibility, as someone answering questions, to understand the standards for closing questions (https://meta.stackoverflow.com/questions/417476) and the motivations behind those standards, and to skip over (better yet, flag or vote to close) those not meeting those standards (https://meta.stackoverflow.com/questions/429808).

You complain, but actually the deck is heavily stacked in your favour: there is a 5-minute grace period on answers; plus you can submit the answer by yourself, regardless of your reputation score, while typical closures (not duplicates and not questions flagged and then seen by someone on the very small moderation team) require three high-rep users (and it used to be five) to agree.

However, the question was not "nuked": the OP gets at least 9 days to fix it and submit for reconsideration before the system deletes it automatically (unless it's so bad that multiple even higher rep users take even further consensus action, on the belief that it fundamentally can't be fixed: see https://meta.stackoverflow.com/questions/426214/when-is-it-a...).

And this overwhelmingly was not done "by mods". It's done by people who acquired significant reputation (of course, this also generally describes the mods), typically by answering many questions.