Okay, let's skip about a hundred steps, toss out the idea of basic human decency and common sense interfering, and make the massive assumption that the US will be able to make weapons able to equal or surpass the Longinus and Transcendants.
You are then making the additional leap in logic that they will then choose to engage the Alliance for no reason beyond paranoia that they themselves may be attacked. Engage an enemy that has multiple members capable of cracking the planet in half. Because they don't want to be attacked by said enemy. They'd have to be completely braindead.
The very fact that the real world, which is far more cynical and brutal than DxD's version of it, has not vanished into a nuclear hellstorm should rather soundly refute your hypothesis.
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Originally Posted by Lucidrago
Human countries have created nuclear weapons that can destroy the world. Is it really all that far-fetched that they can create defense system against supernatural beings with current technology?.
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Yes.
Issei was able to output more energy than the worlds largest nuclear bomb by an order of magnitude...in
volume 2. IN BASE. Sacred Gears and various other powers can break the laws of physics over their knees with zero repercussions. Teleportation, erasure of matter, infinite energy, mind control, creation of infinite soldiers, etc. The US would be starting from scratch and trying to equal the works of actual gods.
Humanity can't do shit. Issei by himself in BxB could destroy our modern world in a matter of hours.