Her Wikipedia page is pretty long, she was a public figure long before this controversy, even ignoring the fact that simply being a billionaire invites public scrutiny.
"Oppose us, and we'll ruin you. And your family."
Turnabout is fair play.
As for the "pro Palestinian protestors", they signed their names, did they not? Did they expect all would be forgiven when they try to get jobs?
I have some sympathy for Ackman, but the methods by which he is achieving his goals undermine his own arguments.
Try being grown-up enough (or maybe "big enough") to stick with the people who've actually offended you.