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Let me just reiterate:
BUY PEPPER SPRAY
You will way more likely be in a situation where you can use non-lethal force, like a homeless bum coming close to you and just breathing on you.
And if all you have is a gun, you can't legally do shit.
But you can shower him in pepper spray and watch him scream and squirm on the ground.
by all means though, buy a gun because it's stupid not to have one in case you need one
but you will way more likely be in a situation where pepper spray is perfect and you will badly wish you had it