Prohibition... The War on Drugs...
Yeah, that all worked... The supply will always meet the demand, with only the cost being impacted.
2 things...
1) Bad examples, as most people didn't agree and engaged/engage in civil disobedience, even law enforcement regularly broke the rules (esp with prohibition). If you look at my initial post, I never said all guns should be illegal, just that there should be rules, esp around full auto ones (which are highly regulated today).
2) Yes, econ 101, supply always meets demand, rise the price high enough and its not a viable option for most criminals.