You can now... and if you were willing to go individually account-by-account, then you always could. I'm glad you found your niche - it's nice to widen your worldview and listen to it all, sometimes:-).
Though I'm on the other end of the spectrum: having spent nearly a decade listening to people's oddball takes on everything under the sun, and bending over backwards to accommodate it all as if it had some semblance of validity, I now find myself wanting to substantially narrow my input stream. Ngl, reading and watching/listening to - and more importantly thinking deeply about - such things as Innuendo Studios' The Alt Right Playbook, and the actual Trump presidency that caused our current inflation crisis and oh yeah killed more people than all wars combined iirc, really changed my approach on giving such viewpoints the time of day. There's a difference between sounding smart (like screetching: "show me your source material, bitch!", while also looking down on the recipient in every way), vs. actually being thus, imho.
However, if you want to keep your finger on the pulse of many sides regarding a particular matter, then I'm so glad that the federated servers allow us each to experience such a diversity of goals, even on the same platform! 😄
I don't feel it's my place to push back on the matter of the locking of the specific post - as we covered, it's your vision that you need to implement.
But since you seem interested in the wider topic in general, I will say that warning people about the variety of ah... "behaviors" that one is likely to encounter across the Fediverse is precisely what I think is most lacking from most instances (at least those that haven't defederated from the most extremist ones, which e.g. my first instance Kbin had, but it is defunct now and anyway it was definitely in the minority there - e.g. across the entire Fediverse the only instance that I've ever seen that has defederated Lemmy.ml is Lemmy.cafe, which I only found about about today:-).
Every single person that I've told about Lemmy irl has come back in the next conversation to say "do you realize the extremist content (advocating for violent overthrow of the government) that is on there?" The thing is, having blocked it myself, I do tend to forget... for me Lemmy is about interesting conversations, fun memes, e.g. about computer coding, etc. But advocation for violence is not something so easily pushed aside, by someone new who doesn't know how to block yet (and what even would they block - a community? a user? an entire instance? being new, they simply do not understand yet what is likely to work, and what each decision entails. what they want to block is "disturbing content", but there is no checkbox for that, and seeing how untruthful so many people are, likely to never be one)
Communities like Chapotraphouse or The Donald or even so many posts in [email protected], which depict e.g. actual decapitation of landlords, is not something that "normal", "mainstream" people in the Western world are wanting to see. e.g. people leaving Twitter/X bc Musk is too extreme and Mastodon too problematic, only to find that generally speaking, Lemmy contains even more extremist content, though on what is claimed to be the leftist side.
So kudos for wanting to carve out an island of sanity. It remains to be seen how people, especially new ones, will find it, amidst all the noise, but still it's a laudable goal. And then I still don't get why new people wouldn't be interested in individual instances - I would be - but that's your business.:-P
I do think it would help to clarify the description of the community though, to make the aims more clear as the Fediverse grows, rather than you having to explain yourself to each poster, after-the-fact. Anyway I wanted to offer that thought - thanks for listening:-).