In the AR it will have less lift than a real full auto, but I concur with you. It isn't accurate and isn't required even if the People had to rise up to stop a totalitarian threat, which would be the scenario requiring the most serious weapons.
I don't know that a ban is really needed but I do think they should be Form 4 restricted at least, so you have to pay the tax and register the weapon. or make them full blown Class III, which means only hard core collectors and gun ranges would have them.
this guy could of course have paid the tax, but clearly he had the money to go get anything he wanted so in this particular case I doubt anything "helps". He also may have had plans to make anfo or a car bomb, etc., and if he lacked the gun options he wanted maybe he goes that way.
But as a matter of design I think this is a case where the 1930s era NFA definitions aren't working for us.
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