I didn't go to FB because I thought it's unethical but "money". I went there because I wanted to work on a product that I and every one of my friends/family uses, that helped me a lot when I was getting divorced, etc. Money was OK, but you can make more money than at FB, eg. in Finance, or other special places.
I've never worked at a company that takes data protection as seriously as FB, or has the caliber of people protecting data.
Also impressive was that _every_ week there was a 1-hour QA where any intern/employee can ask Zuck a question (it's open mic). In my time there I've never seen Zuck really duck a question. He stands behind what his company does and believes in the mission, as do most employees.
"it's the response of lots of pragmatic employees/"investors" being protective and worried about their investment" > sorry, this is just silly...