handguns are much more common in homicides in general, but I think rifles are the weapon of choice in school shootings and other acts of domestic terrorism. they have more potential to kill a larger number of people in a shorter amount of time from a greater distance. in particular I'm thinking about the Las Vegas shooter who infamously used bump stocks to rain bullets on a crowd.

incidentally, we almost banned handguns decades ago. it's my understanding that that attempt at a ban - saved by last minute edits - are responsible for outlawing short-barreled rifles (they were trying to prevent people from making their rifles into handguns.)

They're not JUST for killing people and/or sport. Every reason you could legitimately need a gun for, the broad category "semi auto rifle" covers, so banning them has a disproportionate impact to people who use them legally and as tools vs banning handguns.

but do those purposes need semi-auto? can you not afford the extra second to charge the weapon between shots? the only situation I can envision is needing to protect yourself from criminals with semi-autos, which is a legitimate concern.