This absolutely happens. As an example: https://www.snopes.com/fact-check/man-fired-stop-kidnapping/
"You were employed by The Home Depot until June 19, 2017 when you were fired because you assisted the police in preventing a kidnapping."
So yes, they got fired, but it was a mistake. Certainly drawing attention to yourself may attract more mistakes than blending in, but it works out in the end. (The difference, probably, is that FAANG employees have a little more breathing room than Home Depot employees after not getting a week's worth of pay.)
Come to think of it, a friend of mine got mistakenly fired recently. They totaled her vacation hours wrong, saw that it was over some limit, and just fired her on the spot. I told her to call HR and appeal and they admitted the mistake and rehired her. She then got a higher paying job at a competitor since she was free for interviews for a couple days. So... it happens all the time.
If someone is being kidnapped and you can help safely, take the chance!
Filling out a form to request another team review an account is entirely different. No one is physically interacting, and the company clearly has a sanctioned happy path for this request.
> according to Reagan, he was at work on 12 May 2017 when a co-worker told him he saw a man attack a woman in the parking lot. Reagan said he heard the woman scream: "Somebody help me, he's kidnapping my kid, he's stealing my kid!" Reagan told us he then contacted police, who instructed him to follow the man as he left the store area: "They said, don't touch him, don't engage with him, but keep an eye on him. Let us know where he is going so we know where to go when we get there."
> Reagan said that after returning to the store he was scolded by a supervisor and was fired four weeks later.
Physical intervention didn't occur.
when the situation involves the police, I'd imagine the situation is different. Hence why he was reinstated after blowback. This isn't an employee tackling a violent customer (which should be allowed, but I digress).
If "leadership" gave no reason for the termination or simply said "you left the campus on company hours (outside of break)", they would have been slightly more in the clear (unless the employee sued, of course. That would have been an interesting lawsuit).
But if the person is posting illegal or very graphic content, and the company knows you unbanned them, I think it would raise questions like "how do you know this person" or "what made you trust them?". Which you'll have trouble answering if all you have is their name, email, and the sparse information they gave for why they should be unbanned. You'll argue "this person hid that side of themselves from everyone" but at minimum it calls your judgment into question, and if the company is aware of this kind of service, they'll probe for more information.
Also if someone uses this service repeatedly disguising themselves as different people, it will raise questions why different internal employees kept unbanning them. That would be much more suspicious.
Not to mention it is like any crime - not like murders intentionally get caught either, but they still do.