They not only know how to take a hit, they can actually be graceful about it.

Indeed, and I do my best to upvote comments of arguments (not all deserve) to encourage the continuation.

Some of the best conversations that I have had here have arisen from debate rather than being agreeable (Although I will admit that I have tendency to nod along)

Some of the biggest arguments I have had have created the best relationships. If we make it through starting from an argument, it means we can argue more as friends and perhaps solve some real issues.