Sounds a lot like how healthcare is going to be conducted in this country soon.
The government wants to control every aspect of your day-to-day dealings. They want to control how much water you get to shower in the morning, how many calories you consume at each meal, how much fuel you use to get to and from the office, how much money you spend on meals out, how much you spend on groceries, how much time you spend on your phone and browsing the Internet, what sites you visit on the Internet, with whom you associate, what types of pets you have, how much electricity you use...
What makes you think they don't want to control when and what you trade, regardless as to whether or not that item is legal?
Theft of legally owned weapons is sure to increase. ‘Criminal behavior’ will not be infringed.