Sometimes groups of people making occasional mistakes, none of which are related to any other.
And sometimes groups tend to become pathological, such that no one joining the group is just "someone making occasional mistakes". Groups become like that for various reasons, but one of the qualities that seems most problematic tends to be "authority with minimal or no effective oversight".
This is why most police departments are just cesspits of anti-human torment and oppression. If reddit mods aren't murdering people, I'd chalk that up to the fact that they aren't given sidearms, fetters, and a mandate to patrol the streets.
> I have not seen what you are describing.
Cops never see anything worrisome either. You know, until some 11 yr old is shot in his own home after putting his hands up.
Reddit mods probably have it better in that reporters don't really go out of their way to put their abuses in the headlines.