If one was trying to scientifically "draw broad generalizations" about humans, why would you ever select samples from just one nation (regardless of which one)?
Use a dozen nations, some more developed than others. Heck, use one hundred nations. How else would you be abled to defend statistically valid results?
Leaving out any arbitrary set of 330 million humans would seem to lead you further away from meaningful conclusions. Are Americans not also human?
Singling out one country for inclusion or exclusion sounds like something other than impartial, apolitical science for drawing "broad generalizations".
If you don't like America (or wherever), that's fine and dandy... but please don't call your hand-picked findings the "human condition". Especially if you're going to choose the humans based upon any one individual's peculiar set of ideals.