I may have been lucky my entire life, and maybe its partly due to where I live and other random factors that were not the result of my own actions, but after 60 years I have never been in a situation where I have needed to kill another person to protect myself or someone else.
After 2001 I was an active sailor, and I carried my sailing knife in my pocket all the time, which I could open with one hand (which is what you need on a sail boat to free yourself if you are tangled in ropes), and to some degree I could have used it to defend myself, or attack someone to protect someone else. It was also useful for things like cutting seatbelts at an accident, opening packages, cutting food in a restaurant when they give you those crappy plastic knives... So I was not carrying it around for 20 years for the sole purpose that someday I might have to kill someone with it.
I could easily obtain a CC permit. I was an expert marksman with a 45 in the Coast Guard. I would have to reach the point where I felt it was necessary to have a weapon for the sole purpose of killing another person. So far I have not come to that point, and I think if I was going in that direction I would rather move somewhere else (the Earth is larger than the human mind can really grasp).
Im not posting this to be judgmental of anyone that carries a gun. We all have our personal understanding of the realities of our world. I have always been able to deal with other people, in conflicts and confrontations, without the need to resort to violence. I have insurance on all the things that would be expensive to replace, so I have no need to protect anything by force - Yamaha will be more than happy to build me a new motorcycle, if someone wants mine so much they are willing to steal it, Im not going to stop them.
One of the moments of clarity in my life happened when I was 19. I enlisted in the Coast Guard, and was on my first trip on an plane. The jet just happened to fly over the house where I had lived for my entire life. We were already a mile in the air, and looking down the entire neighborhood was smaller than my thumbnail on the window. 99% of everything I had ever done, all the people I interacted with, were in that tiny little place, then I looked up and could see 100 miles in all directions.
The world really is more vast than we can comprehend.