I wouldn't be happy if, say, objections to an unpopular scientific theory were simply expressed by scientists down-voting and burying it. Unless the idea's completely insane or facetious, I'd want them to respond to it with a measured discussion for many reasons, one of them being that ground-breaking ideas don't always meet with widespread acceptance as soon as they're introduced. I know from personal experience that I've slowly changed my mind after hearing someone argue against my opinion, no matter how much I wanted them to shut up and accept my views!