I don't think needing an enemy is specific to the United States, they are just slightly less shameful than other "modern" countries about it. I quote modern because in many areas of its way to govern, the US seems to be pretty on par with other societies they love to demonize and call "backwards".

I think generally there are people with all sorts of agendas. Unfortunately, in the current state of society, the ones that stick will always be the ones who drive profits the most.

Fear might be the strongest motivator for the average human being. It's not surprising systems fed by conflict and imaginary enemies seem to thrive so much.

It doesn't mean that there aren't bubbles of people who are different, but they are just ripples among the waves.