Download the app called "Blind", where people talk openly while being anonymous.
What you see there is that everyone is trying to maximize their TC (Total Comp). For most people, that's the only goal. The whole "Let's make the world a better place" is something that was sold by PR people.
To talk more specifically about facebook, I have seen two attitudes in their employees:
1)They use Whataboutism when confronted: Basically they will show you that Google and Apple are also evil, so it is ok for them to work at FB.
2) They openly say that they know it is a bad company, but they treat employee very well and they are overly well paid so are ok with it.
For me, It makes me lose faith in engineering