Let's start by keeping it civil and not imposing any conceptual restrictions.
I'm not even sure if someone actually produced a 100% workable fix you guys would agree to it.
I don't disagree with any of that. The challenge is how do you accomplish any or all of those guarantees? I disagree that more laws and regulations are the solution as the ones we already have fail miserably.I'd like to reverse your thinking and put the high standard on ownership.
A guarantee of life-long sanity.
A guarantee the gun will never be in the hands of another.
A guarantee the gun will never be used on a human unless as a provable last resort measure.
A guarantee the gun owner is a capable shot and will not put others at risk in a tense situation.
Is it against the law to leave your infant in the back seat of a hot car to die? If it isn't, do you think passing a law making it illegal will suddenly cause a parent to remember to remove that infant? I think it's been proven that the answer is most likely "no" and that technology is the route to be followed (heartbeat monitors, etc) because humans are, well, prone to F up.
Personally I think a better solution in search of your wanted guarantees will come in the form of technology. Technology that enables existing law to be more effective.