> That's in reach of anyone that can snatch a purse
I went to primary school with some guys who could/would snatch purses. I *promise* you, they are not able to gene edit organisms with FOSS.
I get your general point, but I think the bar to entry is still much higher than petty crime and larceny.
For now in most parts of the world it's easier to acquire a gun either legally or on the "grey market" and be assured that it will work for the intended purpose than to 3D print a gun, find a shooting range to test out the gun and iterate until it works fine enough.
In most part of the world, bullets are illegal. If you are getting "grey market" bullets anyway, it is easy to get a "grey market" gun.