The Las Vegas bump-stock shooting was one of the deadliest in the USA.

https://en.wikipedia.org/wiki/2017_Las_Vegas_shooting

The fully-automatic question comes up because of pragmatism and practicality. The guy used 1000+ bullets to fire upon a crowd. You physically cannot do that if you only had semiautomatic.

I wonder if this might have been more deadly if he had fired fewer shots but deliberately aimed each of them at a person. The percentage of wounded survivors in that shooting was atypical.

That's true, and that's what I was thinking of when I said "few" instead of "none."

Luckily very few mass shooters have plans that are so well thought out.

These aren't the choice you'd use for a planned mass shooting. The problem is gang bangers killing more innocent bystanders with the latest gun fashion.

After three such incidents involving children in Minneapolis in a short period last (?) year I mused on how it would maybe be a good idea for someone to start a nonprofit that brings gang members to gun ranges to train them. I think we'd all rather they kill each other than bystanders.