I think Susan Collins is a great example of this. Her support of Kristi Noem is based on deals she finds acceptable for Maine residents. The fact that other states suffer at the hands of ICE doesn't effect her decision's. Collins feels she only is responsible for Maine and not humans that live outside of Maine.

I find this sort of compartmentalization offensive to the common good.

That's representative democracy for you. Heck, even China faces the same issue, but they get to make it a competition between provinces, on who can win the favor of the emperor. Helps for them that the emperor has supreme authority though.