Pressure cookers used for canning. Canning used to preserve food for long periods of time. Preppers like to can food. Preppers like guns. Preppers like high capacity magazines. Place a ban on pressure cookers and you starve preppers to death, there by decreasing support for high capacity magazines.
Like I said, the idea that you need to "can" food in today's grocery store society is "laughable", unless you are the government (which is the largest and most successful prepper around, whether you know it or not billions and billions have been spent of your tax dollars to build myriad locations that would make the most successful prepper envious).. We must give up our right to can food to protect society from high capacity high pressure cookers and those evil preppers who are the only people who use them... sport cookers don't need high capacity pressure cookers.
Better license them now, pass legislation that already existing high capacity cookers be locked into pressure cooker safes and locks must be designed so that children cannot access the pressure cookers!