A guy at a gun shop told me this analogy when I was 15 shopping with my father:
Imagine a city, somehow perfectly devided down the center by a perfect set of laws, that were enforced 100%.
One side, Side A, NOBODY HAD A GUN. Not even the police.
The other side, Side B, EVERYONE HAD A GUN WHO WAS AN ADULT. EVERYONE.
Now, you are the very first criminal to decide to break the law and rob someone at gunpoint, and you realize that you can ignore laws, and generally people don't get caught.
Which side of the City would you choose to be a Criminal? Well, no need for you to answer...
The point is, a Criminal depends on you to be UNARMED.
Legal Concealed Carry reduces crime, period.