The problem is where does the line end? I can use a Mason jar, metal bits, and some simple household chemicals to make a shrapnel bomb like they used in the Boston Bombing. Should we ban Mason jars? I can additionally buy a dozen consumer drones and then attach those shrapnel bombs and fly them into a crowd at eye level - making the Boston Bombing look tame in comparison.

Are we to ban drones? I can use basic household cleaners to make mustard gas, I can get cyanide from regular items, I can take my car and drive it into a group of children waiting for the bus.

If someone wants to commit a crime, they are going to find a way. There's a line where we have to look and say - the costs of living in a free society means that individuals have the capacity to commit crimes. If we get rid of the capacity to commit crimes entirely, we would have also necessarily gotten rid of the free society.