Facebook is toxic because it fundamentally makes money in an exploitative way that is bad. There is no way for Facebook to both be a business and not be sleezy. I think it's potentially possible we could build something Facebook-like as a non-business, but if we expect it to make a return for investors, it absolutely has to do fundamentally objectionable things to its users and society.
"Once the rockets are up, who cares where they come down? / “That's not my department" says Wernher von Braun
Since name above is quite far from moral person from most news I was able to see related to him/FB, what you state is most probably correct.
No, just the actively bad ones.
The ones who bobble along regardless because their individual tasks are not evil would bobble along just the same in a regime that does care more about doing the right thing (or, at least, doing the wrong thing less).
Unfortunately the actively bad ones are probably good at hiding behind the more apathetic, throwing a few of them under the proverbial bus every now and then.
In fact, now I'm challenging you to cite this. Why say things like this if they're not true? Any broader point about Facebook doesn't even hinge on the veracity of this claim, I don't get it.