I don't know if it is required. I mean who the hell really knows what is "required"? I believe this is totally out of controll anyway. Like what if a multipolar world of several super powers competing with each other actually leads to a nuclear war somewhere in the future? Was it than really "needed"? But I don't think we as humanity can do anything about it anyway. Horror vacui, or better known as nature abhors a vacuum. And the same is true for power it seems. No super power will give up it's power freely. And every emerging super power will always pursue more influence. I am not defending the United States and their foreign policy here. I am just trying to say that what they do is probably natural and not something that's exceptional. Definetly not when you look at it historically. From the wars between Britain with Spain, Britian with France, Britain with Germany, Britain with the US, Britain with Argentina, Britain with, you get the picture. Lets nuke the Brits.