Amid all the heated, emotional advocacy of gun control, have you ever heard even one person present convincing hard evidence that tighter gun control laws have in fact reduced murders?

Think about all the states, communities within states, as well as foreign countries, that have either tight gun control laws or loose or non-existent gun control laws. With so many variations and so many sources of evidence available, surely there would be some compelling evidence somewhere if tighter gun control laws actually reduced the murder rate.