There is no logical reason to close a crag because someone gets hurt xcept due to liablty issues on private proterty. Mokuleia is on State Land? Hawaii isn't about to ban surfing because poeple (many people) get hurt, and all across America we let (encourage) youth to do "dangerous" things with helmets. Riding bicycles and foot ball might start the list.
So IMHO there is no good reason to disallow climbing at Mokuleia - which has nothig to do with what happen there.