This is so ignorant it is beyond common sense. It is like banning knives which are proven more of a threat than assault weapons.
Just for fun I seached online, 3 places for their online stores. Sears, Bed Bath and Beyond, and Target. All 3 of them listed as many as 3 pages of pressure cookers, and as many as 102 different makes and model to choose from.
Banning them would just be stupid, and you probably can find them in garage sales for a few dollars, as they are used less and less in this country, over things like crock pots. My grandmother cooked regularly using a pressure cooker, and use to can all kinds of fruits. She told me that using a pressure cooker was nessesary when cooking and canning meats. She would can many of the game my grandfather would hunt.