I don't think anyone here is arguing that his actions (actually...in this case words, no actions) were appropriate.
I think the argument is...will he never work in Hollywood again because very nasty things said in private were made public?
“I think the argument is...will he never work in Hollywood again because very nasty things said in private were made public?”
I think it is these words coupled with his Anti-Semitic Rant a few years ago.
However, as far as I can tell, there is not law that has been passed that prohibits Mel from working in Hollywood.
Therefore, if you like, you can go out to Hollywood, open a studio, write a screenplay and direct your own movie staring Mel Gibson.