The party is no doubt counting on the U.S. Secret Service to take the blame for prohibiting guns at the convention. So the gathering of embittered factions, including the Trumpistas who are poised to "riot" in the event their leader is denied, will almost surely attend the convention in their capacity as sitting ducks. For Republican leaders, that's a far better outcome than actually living up to their own gun-rights rhetoric. They'd much rather face sitting ducks in the hall than armed chickens come home to roost.