Am I taking crazy pills or are you making no sense?
Shooting a gun is, in most places, super illegal. Even if you don't hit anyone, firing your pistol anywhere where there's people is sure to attract attention from law enforcement, unless at a specially designated area like a gun range.
And what the hell are guns made for if not to shoot?? That's literally the only thing they do!
GP mistakenly imagines that a gun's purpose can also be deterrent even when not shooting. In reality the deterrent ultimately comes from the threat of violence, the shooting. Everything else is a side effect derived from that one. Same goes for nukes.
The best proof is that a gun which obviously cannot shoot (is visibly unloaded, disabled, etc.) doesn't act as a deterrent despite still being a gun.
Do you believe that the people who manufactured the citykiller thermonuclear fusion bombs that exist presently today did so with the express intent that they be detonated and thereby kill millions of innocent people, or do you recognize that perhaps in constructing them they might serve a different purpose than to be detonated?
Guns are the reason police don’t get punched in the face or attacked with sticks. They serve this purpose even while remaining holstered.
Why not answer to what I already said above: is a gun that's guaranteed to not harm you still a deterrent? Is a handgun a deterrent if you are in full-body heavy armor, in an armored vehicle, or just too far away? It's the same gun with the same bullets and the same power, nothing about it changed and lo and behold, the deterrent is gone just because it can no longer kill you.
That deterrent cannot exist without the threat, but the threat can exist without deterrent. A gun or a bomb which cannot kill you will not deter you. The object is worthless, the promise that it can harm or kill you is the only thing that matters. So the only point of the gun and the bomb is to kill. Everything else is a consequence that derives from that.
To answer your points:
Yes, the bombs were built with the single reason to be able to destroy cities and kill millions. Weapon specs don't list and quantify "deterrent" because that's not a characteristic of the weapon. If you build a guaranteed missile shield around you country then that exact "city killer" bomb is no longer a deterrent.
No, the authority is why police doesn't get punched in the face. The authority is backed mainly by law which gives them the right to fine or arrest. Taking away your money or freedom are the the real deterrents (as evidenced by judicial systems relying solely on this in most countries). In most of the world you can punch a police agent in the face and not get shot and people know that so they still do it.
Who or what is shot at is entirely on the end-user of the tool in hand.
Some folks have never once in their entire life ever shot at a person (or even thought to), while having shot many animals to feed themselves or their families. Some folks have never once even shot at a living thing. Some just shoot for "target practice" or for "fun".
If you shoot at people you'd better have a really valid reason or expect consequences to follow.
Thermonuclear weapons weren’t built to destroy the world, either.