Many people think George Bush extremely foolish for refusing to talk to leaders whose policies he doesn't like. Syria is an example. And I agree with that view: Bush has got it all wrong.. As the Godfather said, "Keep your friends close and your enemies closer." It seems to me that one should especially talk to people you detest (and btw I think you can simultaneously be in physical conflict with them at the same time.)
But some people condemn Dennis Kucinich because is willing to appear on the FOX network . (Kucinich and FOX come down on different sides of almost every issue.) I don't get the distinction. Talking with an adversary, especially talking to their followers (e.g. the FOX audience), seems like a particularly important thing to do.
Why not talk? It doesn't mean that you like them or respect them or support them. All you are doing is acknowledging that they exist, which is incontrovertible.