How is basic/safe operation, safe handling procedures (call an adult!) not effective teaching?
Look up the four main rules of firearm safety. Adherence to these rules will all but eliminate the risk of a dangerous malfunction (extremely rare) or fumble (less rare) during firearm operation and cleaning.
Nope, they happen. I'll leave it to you to search for them. For me, there are people who need guns, and people who must not have them. They're killing machines and serve no other purpose (unlike the knife which has utility).
As for the rest of your comment, that line of reasoning has been addressed thousands of times, so I won't bother being thousands plus one. My firearm usage doesn't involve killing anything, so this should be a big glaring hint that there's an error in your reasoning.