In fact, gun control IS effective as any proper look at crime statistics in Canada and the US would support.
Most illegal guns here are sourced from the US, so unfortunately we are not immune from some adverse side effects from your society. Even given that, our crime rates are very much smaller then the US and in recent years violent crime rates in Canadian major cities have been dropping.
It might be more beneficial for you to realize at some point that doing something just because it's the way America "has always done it" doesn't make it the best path. If you want high crime rates, do your best to arm as many citizens as possible and give them freedom to carry almost anywhere. It's a proven formula.