It's hard to feel sympathy, everyone there can get a lower paying job that is beneficial to society and they choose not to. That's on them. Nobody at meta lacks other options.
It's certainly a great loss to have so many brilliant minds work in that crappy business, but let's not compare that to any kind of atrocities humans have been capable of in the west in the 20th century.
To be clear though, while I think ads/fake news etc are bad, they're not the main reasons I am so negative. I believe that at their core, these organizations operate under incentive structures that encourage dis-empowering people at every turn. Regulatory and userbase capture allow them to continually make choices that hurt users and help their bottom line.
It feels like they are emblematic of a world view where normal people aren't trusted with the power of the computer. Where it's okay to play zero sum games. That's vile.