Okay. Here goes:
Drew some comments from people that weren't entirely necessary or helpful
I can't see the deleted comments on any lgbt+ tagged post. I've seen some passing by though, I helped you flag them.
From what I remember, most of these comments are made by people having gotten their voting privileges through an association bonus. I don't know for sure though, so I don't have any statistics on that. Maybe a mod would be willing to check out one or two questions and user profiles and add that information?
On the assumption that these comments are made by drive-by users that get their rep through association bonuses: That's not the IPS community chiming in. These are those monsters I told you about before, in chat. Those that we can't fortify our questions against, only grab our torches and pitchforks from the corner of the barn once they have arrived, to drive them out again as soon as possible.
I think the same goes for the deleted answers you mention in this comment.
I picked the top 10 questions (based on votes, because these are most likely to have hit HNQ/have had a lot of attention). What I'm seeing doesn't really scare me much.
2 Rude/Abusive from users new to this site, who don't seem to be very active members of the community judging from the profiles activity.
1 R/A from a troublesome user that's known for going over the line.
7 deleted for being vlq/naa. (at least they don't show up as being rude/abusive)
1 borderline, where the answer wasn't making a point in a very nice way and the comments definitely were out of line. Deleted as NAA by a mod though.
1 from which I edited out the offensive language.
4 deleted by their owners, sometimes after feedback in comments, not rude.
Now, I'm not saying the rude answers aren't a problem. But I want to say that I'm not seeing the core of this community doing the chiming in. Instead, we're all pretty good at downvoting stuff, flagging comments and keeping the site 'Nice'.
Again: We can only work out the monsters once they're in, we can't fortify the site against them.
Most all questions that mention LGBT+ issues receive a heap of comments and answers that are later deleted
I think the comment bit has to be addressed by a moderator, I'm curious to see how the statistics on those are.
I think I addressed the answer bit myself already. This meta to me reads more like you're reminding the people who are already not doing it, to keep up the good work.
I don't think we, as the core community, can do more than what we're already doing to try and keep this site clean. If we get lots and lots of troublesome users, we call in mods. If we're overrun by hostility, we have CM's. I don't doubt they're monitoring this site closely...
Now, about that one specific question you linked to, I don't think the 5 downvotes are 'excessive', since most of the time I tend to combine down- and close-voting. If your questions happens to be closed by 5 people that tend to do that, it will get 5 downvotes. Even then, users that don't have close-vote privileges but are still seeing a bad question are free to downvote it.
The problem here arises when the community decides we should leave a question open. If such a question is receiving downvotes at random, yes, that will hurt. But again, I can't see a solution that will fortify the site against such nastiness.
@Shog9 was right about one very important thing in his answer though:
Most of all, don't get baited into relaxing the norms of the site - a classic technique is to abuse the sympathy and kindness of those within a community to get around the rules normally intended to prevent problems.
So, for the specific question you linked to, I don't think the downvotes and close votes are a problem. You confirmed this. And I think you might have to brace yourself to this happening more, since lgbt+ is (sadly) an easy topic for writing troll questions. Just like any other topic with regards to sexuality or mental health problems, it's edgy, it attracts users with many opinions but little IPS knowledge on the topic.
Long story short, this is a great public service announcement, but I don't think that right now the core IPS community is the problem here, and I don't see how we can get those from the outside to abide by our rules. If someone wants to stir trouble, they'll find a way