Moderators (requests and notices)

you could argue that it's this uneasy culture of making light of these actions which has allowed people to get away with them for so long.

You could argue that, but I think you'd be wrong, for two reasons. Firstly, the thing which most permits the continued perpetration of crimes is not talking about them at all. If joking about them is the only way we can talk about them, that is still better than being silent. Secondly, there is a difference between making light of something (treating it as though it was of no consequence) and telling uncomfortable truths through jokes. I haven't seen any of the content you're complaining about, so I can't say which of these categories it falls into, but in general jokes about these kinds of subject are rarely intended to make light of them. If you really think somebody is deliberately taking the former position, call them on it.