It's must be so hard to send your son off to college and then find out that he's miserable, especially when he's trying to do something that means so much to him. However, this experience might not only make him a better ball player, but a better man.
I really believe your son ended up at his school for a reason. Even if things seem tough right now, your son may be better off in the long run for sticking it out and dealing with it.
Resist the urge to jump in and make it better. Instead, be his source for strength and encouragement. Let him handle it and interfere only if his health and saftey are at stake.