Bi Polar Bear,
I think that your statement that "Americans are intellectually lazy" is taking a "human" trait and thinking that it is an American one.
Humans and all other evolutionary successful animals are naturally lazy. It makes no sense to expend more energy to reach your goals than is necessary.
A polar bear doesn't chase seals with a full belly. A cheetah that kills more antelopes than is necessary to satisfy its desires would soon become extinct due to the waste of energies. Either the cheetahs or the antelopes. Consequently human also work no harder than what is necessary to fulfill their desires. Desires are often a product of imaginations.
Imagination is what makes the difference. Some humans imagine that they need considerably more resources to survive comfortably than others do.(a subject of frequent discussion when my daughters were teenagers

) Some humans imagine that they need more knowledge or power or things to survive than others do. But no one works any harder than he feels he "has to".

But people some do do productive things for entertainment.
No person seeks out facts when his brain is satiated (satisfied) with theories. If he is happy with dogma then to attempt to seek out knowledge would be counterproductive for him. (A waste of energy)
So I submit that "laziness" is an evolutionally beneficial trait. We should not be surprised or disgusted when we encounter it, sometimes to extremes.
But I do concede that intellectual laziness is the best reason for "homophobia". Kudos