It’s essentially the same question as do you believe machine guns should be regulated?
How many of the National Anthem kneeling, BLM crowd were murdered in Chicago in the past 5 years by guns equipped with Slidefire Stocks? How many suicides are committed with Slidefires? I strongly disagree with anyone who argues that banning these will help reduce murders and gun deaths. Copy Cats? Too late, that cats already out of the bag - plenty sldefires are currently in private hands. And many thousands more were sold in the past week. Me! Me! Me!
But I also recognize that the bumpfire stocks used in Vegas led to significantly more people getting shot. Spray & Pray works when firing directly into a large crowd. And so it goes.
Making precision shots at fish in a barrel could have been much worse, I believe, but I also believe this guy's skill set was probably very limited so perhaps the bump fire did help him. That's probably why he used it. He was a lousy shot.
Its more about the individual, and less about the stock on his rifle.