There's a reason that these companies do what they do. Fraud, breaking the law, and dark patterns are way easier ways to make money than doing so do ethically and legally. Companies either die a hero or live long enough to become a villain.
I'm exaggerating a bit, but realistically the list of ethical tech companies is a lot shorter than the list of unethical ones.
There are levels and degrees of bad behavior.
Facebook is rotten from the head down.
The data collection gives power to those who hold the data. Having all data on someone gives absolute power. It can be both looking at intimate data to directly manipulate or dominate a person, or apply data science to an incredible detailed corpus of data, and in the future learn things about individuals and groups that we can't even fathom.
> literally killing someone
You’ve presumably not read about Myanmar or fbs involvement in organising genocide?