Uber did lots of, if not ethically grey, completely unethical (and unlawful) things. Least of which includes tracking regulators and government inspectors, and also surveillance on their users and celebrities based on the rides they'd take. That's not even counting all the bro culture and sexual harassment that seems to have been rampant.
It does come from the top. A lot of those people that were fired, were hired by Kalanick.
Nobody's shedding a tear for a jerk like Kalanick, especially not after his multi-billion dollar payout. He'll be just fine. In fact, by any stretch of it, he's being HANDSOMELY rewarded for his behavior.
He has simply no reason to change.