For years and years we heard that the problem was with fullterm abortions and as soon as the GOP got their opportunity they started talking about Federal bans.
YOU may not want to ban guns entirely, but are you telling me that you've not seen interviews of people that have admitted that the goal is to slowly remove all guns from circulation.
You also understand that you're asking to prove a negative. A deterrent is a preventative measure. A camera can be a deterrent. You are asking me to prove that a camera doesn't prevent a crime from occuring despite not knowing how many potential criminals have seen that camera and chosen to move on.
Again, it's also short-sighted of you to assume that just because something is working now, that things won't change. Japan is fine now. Canada is fine now. I guess maybe you don't care what kind of changes can occur in a century?