Bump stocks are also extremely rare when it comes to violent crime. I would also say they're the tip of the ice berg when it comes to modifying AR's. I'm gonna take a guess that you aren't overly familiar with firearms, but I say bump stocks being legal are a non-issue because a much simpler and cheaper modification to 90% of AR-15's will make them automatic rifles. The modification can be accomplished with a bit of wire coat hanger, or about 15 cents worth of plastic.
And I say draconian in the context of existing American gun laws.
But real talk, I'm not a gun nut. I'm a leftist that believes the working class should be armed and as a society we need to move towards a system that does mitigate violence. Gun laws alone won't and can't do that. And unless we have a national divorce, I don't see effective gun legislation happening.