More people carrying will probably mean that more people will try to take the law in their own hands.
This really hasn't been shown to be the case. Concealed carry permits have increased dramatically over the last decade yet unjustified shootings are very, very rare among those licensed to carry. Most people don't regard Vermont as the Wild West yet they have (and for a long time) essentially no carry requirements. Anyone that can legally own a gun can carry, no permit required.