My point is that people who want to kill people are going to kill people. Outlawing guns isn't going to fix that problem.
But it makes it a further task to accomplish. Either choose another method, often with their own (different) legal barriers and technical hurdles, or have to create your own illicit gun. Not just pick up the first one handily lying around (yours or anyone else's) or pop over to the neaerest Walmart and buy the first one you can afford, with or without the trivial time to wait until you can actually take it home with you...
@(first)ninja: Having been involved in a Sealed Knot (English Civil War) re-enactment practice, we had muskets fired over our crouched lines of pikes. Obviously no projectiles, but not so obviously
unable to fire projectiles[1].
[1] I don't know if they were all permantly "fire and smoke only" blank-fires, and I've heard of muzzle-ramrods being accidentally projected, so unless you made it impossible to even tamp down the poured charge you couldn't guarantee the musket isn't capable of use. Not sure what the current rules/practice is with modern re-enactment muskets, but similar issues would apply to ACW situations, though breach-loading rifles might be effectively neutered into a projectile-impossible format, even if not outwardly obvious.