Hey Harry, those (though retired) 'flying demons of death' are part of a military that keeps you safe. Sure, it is part of a PR campaign that these Air Shows exist, and to help recruiting, but wherever you're from they are there too.
And it would be ignorant beyond words to try to explain the need of a military to you.
Sad, but true man.
Or do you really think other countries interests in our own are only altruistic?