Regarding concealed carry or simply open carry. You must be carefully certain of a couple of critical things, according to two of my friends who are judges. In some jurisdictions if you fire your weapon, perceiving threat, and you hit a bystander, you may be criminally charged. Be absolutely certain that the person carrying can ascertain real threat to person (NOT PROPERTY!) In many jurisdictions shooting a thief, not on your property, who presents no physical threat to you is a criminal act. Do not put a firearm in the hands of a person who may have it taken from them. (Many handguns taken from gang bangers were taken by force from dainty little wives who really didn't want anyone to get hurt.
Locally, in the last few days, one of my friends had to preside over this case. A fellow in a wealthy suburb of St. Paul looked out his front window and saw what he thought was a thief removing a package from in front of his door. He grabbed his firearm, threw open the door, and wounded the alleged thief. Turns out, it was a mistaken delivery that the driver was going to correct. The shooter's liability insurance company, within days, cut the wounded a check for $1-million, the maximum of the policy. My friend had to decide if the criminal charges filed should stand or if on appeal they'd be dismissed.