Earlier quoted context omitted.
I'm concerned that your machine guns have the potential to harm others. The rest though, by all means...
Maybe we could create a law that makes harming others with machine guns illegal...
Well, we already have laws that make the possession of heroin illegal. They are broken all the time. With regards to the original point about silly laws that prevent us from spending our money and free time in ways that don't harm others, if person A is walking down the street and person B illegally uses heroin on the same street, person A is not likely to be harmed. You can't really say the same about person B and his/her machine gun.