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At your first argument, no, .22 ammo does not do much damage to the body. Yes, if you make a perfect shot it may be capable of killing someone, but in general it is not a defense/kill round. If gun prices go up, then so will the resale prices for those selling them to the cartel, it really doesn't help anything, and really just keeps people from being able to practice and have fun with their guns.
To the second point, I cannot disagree more. you have no idea what those robbers had in mind, A LOT of robberies end in the robbers shooting the people that they are robbing. I would much rather have everyone dunk in cover and allow one citizen the chance to save the day. Robbers arent expecting to come under fire, and 99% of the time they react exactly as those robber did.