He could have come back the next day if he had the right material to go with it. That's the magic and the mad responsibility of standup - you can go anywhere you want to go if you write it right and you'll be buried behind a hot-button issue forever if you dont. I'm not saying comics weren't as damaged by 9/11 and other tragic occurences as we all were but, in the back of the minds of every one of them worth their salt, they were writing the bit that would make them the first one to get us laughing again. Cancer, abortion, mangled baby ducks, it don't matter if it's written and timed right and Louis Ck or any other comic who's done something wrong can get back on that stage and get all the laughs he's capable of, but he's gotta deal. To quote the most famous standup comedian of all time "That's an awful big matzo ball to leave hangin' out there".