Vietnam, Afghanistan, Ukraine, etc. Point is, a large and powerful military doesn't guarantee victory. History has repeatedly shown this.
One has to look deeper; take philanthropy as an easy example. The U.S. leads in terms of absolute dollars, but when measured properly taking into account percent of GDP, labor donation, etc., America doesn't even make the top 20. A country with 5% the population and roughly a quarter of the world's wealth complaining of unfair treatment doesn't sound very philanthropic.
If you wish to turn off the news, that's your prerogative, but don't be inclined to tell me how to live my life. And yes, as a family man with young children, I worry about someone doing something stupid, that's my prerogative.