If we take 5 random guys and 5 random women - strip them naked and throw them in a cage together (just like the chimpanzees) - wouldn't they soon be squabbling and mating with each other and generally behaving like apes? Is civilisation a fascade?
Going back to the 80's -- your average action star looked more like a superhuman. Take Arnold, Stallone, and Dolph Lundgren for example. It was all about being manly, bulging with muscles, and doing crazy stuff like punching out a camel and getting up after being shot several times.
Nowadays...
I think in the very near future the US will be regarded as "just another country" rather than anything resembling a superpower. All the social and economic trends over the past 30 years seem to point in that direction. We may have a period where no country can be called a superpower, but...