Montequi--I agree wholeheartedly. If a DB can't make the catch make sure nobody else can do it either--swat it to the ground.
I sense DBs get a bad rap about not catching balls because they don't! They are so focused on not getting beaten by the wR they are covering, the thought about catching the ball when it's on the way is all but a momentary thought. The better DBs not only cover, they believe the ball is intended for them. It's a mindset that few DBs have. Practice, and experience, may adjust that mindset. However, some DBs will never get it.