Re: Is it bad to..
The short answer is "no" is doesn't hurt a thing.
The long answer is the military, and the Marine Corps specifically drops the carrier with the bolt release at the end of the "inspection arms" Drill movement. To do this with precision (so that the entire platoon sounds like one) takes many, many, many weeks of work executing the move. Now add to that the weeks of dry fire practice leading up to a rifle qualification week and you can see these rifles have the carrier slammed home countless times. The rifles are still battle ready and still able to punch a man sized target at 500 yards.
I allow the bolt carrier to slam home on my AR10 and it's still an MOA rifle.