Not to be dismissive, but it's very clear you don't know what you're talking about here. Fundamentally, to put oneself in a situation where an accidental discharge (operator-caused or not) poses a health risk, you've already violated several fundamental rules of gun safety. So these things fall very squarely into the realm of "negligent mishandling". I can think of very few scenarios where I would attribute a "cleaning accident" to the gun, as opposed to an ignorant operator.

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.