The premise is… should there be something restraining California from mass extermination of people who aren’t letting their kids be subject to pornography in elementary school.
There is definitely a role for The Constitution. To say the states are the ultimate authority is a frightening and deadly concept.
States are not democracies. They are mobocracies being ruled by population dense cities like NYC and San Fran. These cities drive representation at the federal level, policies and laws.
If you want this type of rule, please do allow unrestrained state administration.
The constitution is not about rights, it is about restrains and is our only protection from mobocracies. Essentially mobocracies from rat infested metropolitan areas.
I started off saying gurantneeing a republican form of government. States rights means observing the rights of the people within those states.