A straw-man presentation.
Using their logic, we should allow neither the military, nor the police access to weapons.
(which begs the question - why are their “bad guys” so good with guns?)
I forgot to mention that very point! They are police officers! What a deal. Rookies against well-trained shooters.
As several people have mentioned, most bad guys have NO training. They just think you get a gun, shoot a couple of trees or telephone poles (of course with 'gangsta style' since you gots to look slick), and you be ready to go.