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That's only true if your gun is not covering your allies' back as well as yours. NATO is a mutual defense treaty, yes? An attack on one is an attack on all. This makes picking off member nations one by one difficult and costly, hence not worthwhile. As a result, the safety of members against would-be aggressors is increased. If you put down your gun, your allies will most likely have to use theirs, decreasing their ability to defend themselves. Also, there is the loss of life and resources to defend you.
But don't worry; be happy.
At least your ukelele will give them something to listen to. If they get time while frantically trying to cover for you, that is.
Ask yourself how many nations were fed to Hitler to appease him. France and England did nothing. Surely, the Germans will get the resources they want and settle down, right? The needs of the many outweigh the needs of the few... so those other nations will just have to live as Germans now. No big deal.
You somehow think that if an aggressive nation has all that it needs and possibly wants, that it will be satisfied... that they will be satisfied to co-exist with you in peace and harmony, for the benefit of all... and
it would benefit all. The problem is, those nations at this point at least, would like nothing better than to consume and expand with no end in sight.
Simplistically, put it this way:
How do you pacify a spoiled rotten 3 or 4-year old bully? He is bigger than all of his classmates. When the others have one or two toys, and he has three or four toys, he still isn't happy. He attacks and hits those around him and prevents them from enjoying their toys, too... he is the only one allowed to be happy. This makes him happy, because then he feels powerful at the center of attention.
Now, the others can keep the bully in check by forming a team... if the bully attacks one, they all defend the person being attacked. Now the bully sees that he / she cannot get what they want. After a while, they stop trying to attack the others, as it is harmful to their own self-interest.
Now, to change the behavior of the child... he / she must learn that such behavior is unacceptable and will lead to undesirable consequences for him / her. Say, for example, if the bully attacks, one of the bully's toys gets taken away by the group, until the bully has behaved without incident. Then, after a while of behaving acceptably, maybe you could try to convince them that you really want them to be on your side... try sharing a toy, maybe giving them one. If they see this as weakness and attack, take back the toy and take one of theirs until they behave. Eventually, perhaps they will see the light. But then again, perhaps not.
Of course, this is a very simplistic comparison and I'm sure all sorts of holes can be picked in it. But you do see what I'm getting at? Bullys can't be tamed by acquiescing to their unreasonable demands.