NK has shown that having a military force in SK is necessary, although thankfully military exercises seem to be enough for now.
And yet you can't answer when I ask for an example of how the tiny, impoverished state of NK has "bullied" the US. In reality, it's not about responding to bullying, it's just about extending the scope and authority of your empire.
China is the only country that seems to be able to function in a peaceful way. Ideally, there would be more cooperation between China and the US, and ideally, the other countries would just continue to focus on peaceful cooperation. But instead they start wars.
Aww, peaceful smol bean America just wants to live in peace and harmony with everyone, but everyone else is just so aggressive.
Meanwhile, back in this reality:
Again, it's just empire building. You think you're somehow different from every other empire because you have all these justifications, but every empire has had similar justifications:
There was no corner of the known world where some interest was not alleged to be in danger or under actual attack. If the interests were not Roman, they were those of Rome's allies; and if Rome had no allies, then allies would be invented. When it was utterly impossible to contrive such an interest—why, then it was the national honor that had been insulted. The fight was always invested with an aura of legality. Rome was always being attacked by evil-minded neighbors, always fighting for a breathing space. The whole world was pervaded by a host of enemies, and it was manifestly Rome's duty to guard against their indubitably aggressive designs. They were enemies who only waited to fall on the Roman people.
- Historian Joseph Schumpeter
Likewise, the British empire was said to have been built in "a fit of absentmindedness," as if it kept acquiring territory accidentally through "keeping the peace" around the world.
You are no different, and history will remember your empire no differently than those of the past.