I think all the social media stuff is missing the mark. It's 100% bad but it's just trash filling the hole society is making. Looking top down at the problem, humans need self actualization or propose to be happy. Originally we evolved to live in medium sized social groups that worked together to ensure their survival, we took care of each other and that was what drove our purpose, or rather why that need evolved, it…
That being said I do think you're right. It's just that there's two underlying trends here of "mental illness". The one your addressing has been longer term and more pervasive while the recent trend is, as stated, a new trend and seemingly caused by social media.