Earlier quoted context omitted.
Adding a piece of metal to the end of a barrel doesn't increase the probability of someone getting shot. It doesn't increase the chances of the gun to fire accidentally.
Does the loudness of a gun deter its use in the commission of a crime? I think it does, though perhaps only in a handful of cases. Gang violence comes to mind: the gun's loudness gives you away if you're sneaking up on folks, and makes it easier for law enforcement to locate you. If a gun's loudness sometimes acts as a deterrent, then the availability of this "piece of metal" will reduce/eliminate this deterrent, and…
"A 30-decibel reduction in theory means an AR-15 rifle would have a noise equivalent of 132 decibels. That is considered equivalent to a gunshot or a jackhammer." Are firearms with a silencer 'quiet'? - The Washington Post