Not everyone has the same thresholds wrt to morality. There are software engineers making peanuts while writing some of the most unethical crap you'd imagine. I too would require a ton of money to suppress my feelings against facebook in order to work for them. Others are just looking to get into FAANG... And it's hard to believe (it took me a while to reach out of my bubble and realize this), but there are people who legit think Facebook has a positive effect on society. So.. yeah