I actually think modern society is horrible in all sorts of ways leading to, among other things, rising rates of mental health issues. But I fail to see the connection between rising rates of depression and mental health issues and what's being discussed here.

Diagnosis of depression going up (as shown in the first link) don't necessarily mean incidents of depression are going up. It could be that more people are trying to treat it than before.

The stats are clear. Causality... not so much.

Aye, we're diagnosing things at a much higher rate than before.

I am not sure how this relates to OPs comment about "f*cked up" videos being posted. There is no connection between depression and becoming interested in posting gruesome videos.