i hope a person skilled enough to make a gun can make a good decision on how to use it, though that was not the case in the halle failed shooting where a guy 3D printed a gun, that was too low quality to shoot open the door of a synagogue... also sometimes delaying the process of getting a gun can prevent shootings, as they are often based on impulsive behaviour caused by current emotional state. so having a gun check that takes 3 weeks, which is the case for 1 state in USA, can prevent shooting, while not restricting access to guns...