Its just the perspective. How many posters disappeared or greatly stopped posting after Trump won? quite a few. The ones that did stay, post less, because their identity is so tied into their politics, that this place has become triggering.
If Mueller is able to get something on Trump or Trump is out of office, suddenly, those complaining about how shitty this place has been will say "this place is awesome again".
The core content hasn't changed, its the poster's own perspective on things.
Those posters triggered by Trump with the Trump Derangement Syndrome are probably miserable in other parts of their lives as well. Reality is miserable, just because Trump won and Trump is everything they think they are against. Something that really doesn't affect them directly changes their day to day mood.