there have always been losers, junkies and assholes. i'd rather have some of them but an entire society of adults brainwashed into wearing mental diapers.
are you a native speaker? i'd have made a bet that but works here just as well as than.
anyway ... social media doesn't _make_ anybody wear mental diapers. maybe offers or sells but only government can make you wear them.
As you have it there, "but" would mean the latter is an unfortunate consequence or side-effect of the former, and you're getting both. Whereas "than" would mean you're getting the former and not the latter.
You could argue the opposite, it's social media that's creating a society of adults wearing mental diapers. This article is excellent: https://www.theatlantic.com/magazine/archive/2022/05/social-...
And this is worth a skim: https://m.huffingtonpost.co.uk/entry/internet-baby-boomers-m...