There is a huge difference between anger and rage. Anger we are in control , rage we are not. Much like Roberto Alomar years ago when he spit on the Umpire as time went on he made his apologies, in time gained a friendship with umpire. But Alomar's great career will always be stained by his repugnant act of rage. Sadly in light of his great career rightly so. A person does reap what the sow.
Similarly there is no rationalizing that the comments this man made were or are acceptable in any form, such comments are not a person voicing anger but clearly out of control rage.
A Comedian in a comedy club who cannot take hecklers most certainly find other work to do , as hecklers are part of the territory , just the same as fans booing during athletic events.
Its human for such things to make a person angry, but nobody anywhere has right to lose control and spew that sort of crap. Clearly at any event there are event personal to take care of people who are out of line , the participants need just avail themselves of these people.
Hopefully in time this man will do his best with the stage and forum he has to try to build bridges between peoples rather than burn them, and help build trust and compassion for each other. Americans are a forgiving people to some extent is a man does his best in a sincere fashion to make amends, but still he will bare this scar and rightly so.