Mandatory car insurance like we have here in Mo is required to operate a car on the public highway, in case YOU cause an accident, it is for liability. You can own all the cars you want and operate them on private property. They are basically saying they want insurance against someone STEALING or otherwise gaining access to your firearms and using them to commit an atrocity. If I accidentally shoot someone, you bet your butt I will be sued. However, if you steal my car and then run over someone, my insurance is worthless for that purpose. It should be the same for firearms if at all, any insurance would have to relate to MY actions, not others, and that is NOT what they are proposing. There are no cars mentioned in the constitution, as they are fond of referring too.