Hyper-individualism is a much more modern idea that may have its roots in our founding but it was exploited by capitalism during the post-war financial boom last century.

Before we had media showing us "how it should be" families lived together throughout their lives, communities helped each other and American towns pulled together and helped each other in a variety of ways. The whole idea of single-family homes was invented by the housing industry to get people to buy three to four times as many homes. To sell this they started leaning harder into the idea that you're the protagonist, you specifically, you are special just for being American, you are special for wanting your own things (that are advertised to you) and so on.

And before industrialized America and throughout the last several hundred MILLENNIA we were a communal species, it's why we have so much contradictory hard-wiring that influences how we feel about our social standing, about other people's feelings towards us, why there are so many people who latch onto authoritarians and fear strangers. These are ideas that run in direct opposition to "rugged individualism" and they are clear signs we're not living the way we've been designed by literally millions of years of evolution.

Capitalism has pried apart the very fabric of our species and weaponized it.