The US government exists solely to deal with international matters and to protect state and individual rights. The powers given to the government by the states are pursuant to those needs.

That is not libertarian extremism. That is historical fact.

If the states thought their way of life was secure from violence perpetrated by other states or nations none of them would have ratified the Constitution. A central government was seen as a necessary evil to prevent foreign invasion. Even then it took considerable effort to convince states a central government was necessary.