Any other use for semi-automatic rifles aside from killing people?
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Hunting, the Olympics, sport shooting competitions, target shooting, predator control, home security, teaching young people about responsibility, careers in gunsmithing, family fun at the range, wow the list just goes on and on...
Your argument seems to be, that the more uses a thing has, the more value it has, and the more carnage society will accept.
So if a semi-auto rifle has many identified uses, we should be accepting a level of carnage, like we do with vehicles.
There are many many things that kill far more Americans then guns do.
Like cheeseburgers and fries.