"MOST" people go there entire life with out carrying a gun at all. "MOST" of them are never victims of a violent act that a gun would stop.
"MOST" defensive shootings only required 1-2 shots.
I dont think it is possible to prepare for "ALL" situations.
"I ask, Sir, What is the militia?" "Its the whole of the people. To disarm the people is the best and most effectual way to enslave them" -George Mason Co-Author of the second amendment.