Several of them didn't back off. I didn't roll over on my back and show my belly, for Pete's sake. Every one of them played out differently. The point, though, is that in none of those situations did I react with overwhelming force. Instead, I reacted with appropriate force in order to keep myself and others safe, without doing more damage to the other guy than necessary. AND, if I had a gun, I'm not sure that would have been possible.
Sure it is. Having a gun doesn't mean you have to use it. It seems like your idea of overwhelming force equates to lethal force. That's not at all true. All it means is you have more options.