@Gargron Agreed! Some people are misusing CW's and some are even using it as a subject, like in email. Of course everyone can use it like they want, but saying it's the culture here is wishful thinking and tone policing.
I use the CW only for NSFW content, like violence and other disturbing things, and spoilers. Politics is not one of them. Besides that everything is politics, so we will end up only with CW's, it also feeds apolitical behaviour and that is dangerous.
As you said, filters are the way to go. Also content under CW's don't have preview cards.