"Republicunt": why use terms like this?

[shadow]

I call them cunts, because they act like cunts.  When they stop acting like a cunt, I'll stop calling them that.

Why, though? What's the actual purpose of calling anyone that? I can only assume it is to create a hostile environment for them to chase people you dislike away - pressure them out of the group. Is that the outcome you want on a discussion forum, though; to ensure that you will not come in contact with anyone from massively powerful groups with millions if not billions of members (like Republicans or Christians)? Do you not want a chance to either consider their views, or to try to convince them of your own, or understand their paradigm even if you don't agree with it? 

I think that attitude is close-minded and divisive.