The rights of audience members
As an audience member, why should I not be able to question and comment on what is being presented? Should I just sit and accept, without question, what is being said? As a presenter, do I not want people to discuss my work and ask questions, and yes, even criticize?

I'm so tempted to raise my hand during a sermon...
I support democracy but sometimes listening to certain questions that are more about the audience member pointing out there own intelligence is a little much. A clarifying question - good. Reserving Q and A time is a good way as well to gather audience input.