Statistics and facts won't help your argument because the anti-gun crowd refuses to use logical reasoning.

If you told an anti-gun person that 4 billion mass murders were prevented last year because a person carrying a concealed handgun stopped it from happening and you had all the facts to back this up, the anti-gun person would still say "if no one had guns there would have been no gun deaths at all last year". They are unwilling to accept the facts, especially the facts which proves that their reasoning is flawed.