I'd submit that a better lens to understand what is going on is to understand that the culture of the United States really is very diverse, whereas European cultures often sit on centuries of history and cultural inertia (not necessarily in a bad sense of inertia). What in a European culture can be simply unspoken must be explicit in the discourse of the United States. What a Frenchman may expect from his police may be quite uniform between both the police and the policed (at least relative to the US), whereas in the US it must be constantly spelled out in the culture. Some of the individualism is probably also a reaction to the fact that we can't all just settle into a pluralistic culture, because in the US, the first question would be "which one?", followed by "why that one?" for almost everybody who doesn't come from that culture.

Remember, a "European country", which may still consider itself to have several distinct subcultures within itself, is generally only the size of an American state, and even within that division, a great deal more culturally unified than any American state.

In a way, telling Americas about how they need to be less individualistic is putting the cart before the horse... there's no way to make that happen without massive, massive changes to the substrate of the entire country first. No matter how desirable or undesirable it may be, it simply isn't an option open to the United States. Nor, for that matter, would I really go around wearing your cultural pluralism as some badge of pride as if it were some deliberate choice.

(BTW, keep trying to grow the EU and you'll create the exact same dynamics within it, if they don't already exist.)