I don't think we disagree. My point is very much in line with "any such key can't be kept from the bad guys, whoever they may be". Even if you give it to only

I don't think we disagree. My point is very much in line with "any such key can't be kept from the bad guys, whoever they may be". Even if you give it to only the "good guys" and somehow ensure that nobody else could get it, there's no way to know the "good guys" will always be "good". It all depends on context. If the NSA is stopping people from harming innocents, they (rightfully) think they're the good guys. If they are secretly spying on said innocents without their consent, people (rightfully) think they're the bad guys.