Phil,
As a USAF officer and former nuke warrior (in the ground vs aircrew however), on a basically practical matter, you are correct.
There are enormous safeguards designed in to prevent any sort of accidental discharge even in the event of a crash.
From a pragmatic standpoint, however, this is important because these ARE nukes. Not having 100% accountability 100% of the time leaves the possibility open to something being 'misplaced' and not being discovered until something bad happens at a time/place we weren't expecting.
Complacency happened since there's no real thought about the 'good ol' days' of the going 'nukler toe to toe with the Russkis (apologies to Slim Whitman in Dr. Strangelove)' and folks got sloppy.
That is just unacceptable dealing with anything that can go 'boom,' not to mention things that REALLY go boom.
In my opinion...........