I don't think debate is a bad word at all. I've been told by many a professional that I missing my calling when it comes to that sort of thing. I LOVE a healthy debate...in the right and appropriate setting.
There are good and healthy debates...agreed. It can get to a point, though, that bringing debates into a situation that isn't "prime" for it cause cause others to feel defensive because they feel criticized or other negative feeling. Then it's no longer a debate, but turns into a heated discussion/argument. That's one reason it's specifically discouraged in this forum. Spirituality generally has so much emotion connected that debate isn't usually a successful discussion tool.
As I said, I'd love to meet some here

in a different setting someday for healthy "debating". It doesn't mean that I find alot of situations here opportunity for the same. PC is mostly to give/gain support, sharing of knowledge and experiences and, once in a while, a healthy debate. That's the exception though in my experience.
On the topic of debate, I think timing and appropriateness paramount considerations for any success.
KD