*sighs* This is a hard call, and certainly you've asked a valid question. I'm a bit uncomfortable with the idea that expressing an idea makes you responsible for another's actions.

On the other hand... when one is a public figure, one is doing it for power. As a (VERY MINOR) public figure, I do feel a certain level of responsibility to express ideas I'd like to see implemented, but would be quite horrified if someone took a remark of mine as justification to do someone direct physical harm.

Ultimately? I think the responsibility for an action resides in the person performing the act.