Want to know WHY we have so damn many warheads?
Presuming you're talking about nuclear warheads (the topic of the discussion)... Back in the 50's and 60's it was mostly determined by how many weapons we could produce - the unholy alliance between SAC and the nuclear weapons production labs was the "military-inductrial alliance" Eisenhower was warning us against. From the 70's onward it was determined by a complex interaction of internal (US) politics and treaty negotiations.
The weapon folks try to figure out what the target defenses are capable of before the warheads reach their target, the really smart people start crunching numbers and come up with a solution designed to over-saturate their ( known ) defenses. We don't throw one warhead at a target, we throw several to ensure one gets through.
Um... nonsense. (The fact that there isn't effective defenses against most classes of nuclear weapons aside.) We throw (threw, since we're talking before the reductions of the 1990's) several at what appears to be a single target to the ignorant and the uninitiated to justify the massive number of warheads. To the way of thinking of the military planners - that HQ is a target, and the airfield is a target, and that hangar complex is a target... so even if a single warhead would get all three in actuality, they sent three anyhow.
As far as conventional weapons... you're partly right, partly wrong, and partly hallucinating. But I'm not going there as conventional weapons aren't the topic of discussion.
TBH though, our land based delivery systems are pretty much honeypot targets anymore. Bomber, sub and cruise missile delivery are much harder to target due to their mobility and not knowing if a sub is sitting just off your coast in the event you do something stupid is quite a deterrent in its own right.
Since bombers are landbased delivery systems... you really haven't thought this through very well. Nor do we have sub launched nuclear tipped cruise missiles. We do have submarine launched ballistic missiles, but they stay well the hell back out in the deeps where it's safe... and don't go anywhere near coastlines except for liberty ports and home ports.
However, put one of these weapons in the hands of a fanatic who has no issues about beheading folks, or volunteering to become a suicide bomber to kill infidels in the name of some pretend deity in the sky and all the deterrent in the world isn't going to stop them. Deterrent doesn't work with these types. You have to render them inoperable for lack of a better way to phrase it.
Thank you Captain Obvious.