you are posing 2 ideas
anyone who holds a gun and trains with it is at the right to an advantage, which they can use to protect themselves from others. if you were approached with a knife and mugged, what would you do with a gun available to you? and what would you do without one? the idea of the firearm is absolutely the framing ideal of all are equal, as an example, on the YouTube channel, "Donut Operator"there is a video labeled "Huge Homeless Man vs Armed Female Cop," it shows 2 key examples of why and how it is necessary to learn and do due diligence to protect yourself and those around you.
but if you don't want to do your own research, that's on you