Doesn't matter what purpose they serve if any. You completely miss the entire point here. What purpose is there for making and selling any kind of firearm if a bow and arrow or a slingshot can be used to kill with instead? Ludicrous you say? I rest my case.
No, I do not miss the point. I understand it completely.
I had never heard of or seen a bump stock before the Las Vegas shooting and have shot and hunted all my life. If they were so good to have I’m sure I would have heard about them.