As an aside, having scroll that thread, Reddit is a shambles. There's more deleted comments and related justification comment than actual comments. Make for a jarring experience.
Whenever a platform is popular these days I just assume it is more addictive.
My solution would be to simply delete the comment and PM the OP. If another user had already replied, replace the original content with a *short* reason for deletion, and PM the OP, leaving the replies in place unless they needed deleting.
10 paragraphs later
You are now fully educated on this threads rules, please revisit the top of the thread to remember why to came here in the first place.
Their standards of quality are very high. It's not a sub to push your views or argue, it's a sub for historians or people who can back an answer with academic references. So most comments and answers will get modded.
It's oddly refreshing. No flamewars, no junk comments, no "everybody knows the reason X did Y is Z" because that won't be accepted by the mods.
It's not perfect, but it's good enough.