I have a theory, that the UK and the US are always at war so that the wars never come home.
There is always a war going on somewhere, to make sure it is never at home, they join in other peoples wars so the world will always be reminded that they have an army.
1. The other countrys are too busy to notice the things we do.
2. We supply the arms, which implys we can out gun them.
3. Jobs, always good, till everyone wants to take early redunadancy- we will have a way to sort that out
4. Keeps us fresh in peoples minds, good for business.
So there is a reason for all this maddness, it's a coldly calculated decision.