I learned something a long time ago. Only the bad guy knows when the violence is going to start. A lot of police every year are killed. The tragedy is, they had a gun.
If the bad guy has his gun in his hand and you have yours in your holster, you lose. Period, its over.
One problem with carrying a gun is it may make the reasonable man brave longer than he would usually be. Sometimes it ends badly, very badly.
Here in Texas a man shot a burglar, only problem is he was not the victim and nobody was in danger. Now that "murder" is a tragedy.