You're using too much club on your approach. That bump stocks existed was never presented as part of the equation. You specifically asked "why" and I answered with the gun community at large, particularly as it regards the 2A and gun rights, barely moved the needle. How many people, and I'm talking gun people, would get their ire all fired up over the banning of trigger cranks? Depending on how it went down the property issue could still be there but again...you just aren't going to move the needle with that one even among the at large gun community.
Some did get pretty pizzed about the bump stock thing but see above. It's no small conflation to try and run what the reaction would be to something that can only be described as tangentially a 2A issue vs some as yet undescribed (but would have to be definitionally overt to be germane to the conversation) hit on the 2A. Obviously your opinion is your own so fair enough and all that but you seem to be awfully assumptive. Much more so than I can bring myself to be.