OK, so some people want a mandatory carry law…
If everyone has a gun, the theory goes, less violent death will occur because people will be armed and able to defend themselves.
The problems with this:
Armed robbery: when someone robs someone currently at gunpoint, there is a very slim chance the person being robbed is armed, so the robber can usually get away with this without using the gun (if he even had one, and wasn’t just pretending)
if there were a mandatory carry law, the robber would have to assume the target was armed. if he still wanted to rob them, he would have to shoot first and then rob.
but wait, you say! shooting someone adds an additional charge of such magnitude, that most robbers will be deterred from committing the crime.
even if this is true, there are still those robbers who are willing to shoot someone. these can be people who think they are good enough to get away with it, desperately need the money and are willing to do anything, or people who are just plain sadistic/sociopathic, and have zero qualms about shooting/killing someone. these people exist now. theres a good chance though, that at least some of them still dont shoot people now, knowing the consequences, and also knowing that due to the extreme unlikelihood of a target being armed, they dont need to shoot. but if there were mandatory carry laws, these people would need to shoot. i think that a mandatory carry law, in addition to accidental discharges, drunken fights that go to far, heated exchanges that get out of hand, etc. would increase the number of violent deaths/injuries associated with armed robberies.
basically, it may deter some thugs, but the hardened criminals, the psychos, and the desperate would shoot/kill more people, so you are eliminating the mid-range crimes and increasing the extreme crimes.