Personally, I think that some people don't have the discipline or desire to improve.
Its much the same flying high performance, slope sailplanes. Some folks I know are talented aerobatic freestyle pilots, but when you ask them to race their plane on a course, the don't fair well. Its the "precision" aspect that causes them problems. When they have to turn their plane in the same spot every time in varying conditions, they have trouble. Its because they have not been forced ever to do that.
There is nothing wrong at all with sport flying, nor flying in comps. Its a matter of what catches your interest. For some folks, MEASURABLE improvement is what they need to make them happy. They are normally goal oriented folks.
Others just want to unwind and don't want to feel any pressure. Those folks just like to hang out with like minded people that have the same hobby.
I feel that ALL of us have BOTH of those people in us, just some more than the other.
Are we really so different? Both sport and competition flyers love to feel the pull of the handle, right??
I personally don't see any reason for a rift. I think that some people just like drama....
Regards to all, comp and sport.

Chris