Questions – Gun Politics: If Criminals Don’t Obey Gun Laws, why do they seem to obey laws about full auto weapons, grenades, and Destructive devices?

If “criminals don’t listen to gun laws”, then why do they obey laws about fully automatic weapons, grenades, and other weapons? Aren’t the pro gun people just trying to make a convenient argument?   When a question is worded this way, it’s disingenuous at best....