That's pretty crazy. It takes an incredible faith in the good intentions of other people to believe that everything that happens after a talk is solely the res

That's pretty crazy. It takes an incredible faith in the good intentions of other people to believe that everything that happens after a talk is solely the responsibility of the speaker. Just as all speakers are not created equal, the audience isn't a uniform group of do-gooders ready to ask excellent questions given the correct provocation. There are bad apples, and there are stupid questions, and they get asked whether the speaker gave a good talk or not.