Actually what happened is instead of acting like professionals and adults and just stating that Crockford was no longer in the lineup, the organizers kindly let us know that some people wouldn't be 'comfortable' if he was there. I mean he makes jokes about 'weak maps' ooooh scary.

And thus people are rightly angry, the conference organizers also apologized and rightly so but they still deserve to be called out themselves for total incompetence.