Don't forget that the combined US domestic police budgets (ignoring prisons) is something like the 3rd largest military budget in the world and now the Immigration and Customs Enforcement budget is on par with that.

The US isn't building that much violent force because of culture. They do it because they are constantly deploying violence for their own benefits and gains.

Which stands in stark contrast to literally every other nation with the exception of the former Western European colonial powers.