This is frequently the problem with cries of "leave it to the States".
It continuously fractures and erodes the concept of "United States".
I'd also add that, all too often, those advocating for "States rights" are only doing so when it's a topic they'd prefer to go a certain way. As soon as a State is doing something they don't like, all of the sudden "States rights" disappears.
It's most frequently pretty disingenuous.
Example one is always "whatever California is doing" and how that's routinely under attack from others in the Country.
But again, you are forgetting the fact we have a federal system. So long as something doesn't restrict a constitutional right, states, under the 10th Amendment, are free to enact something. The anti-federalists WANTED all power residing in the federal government, but they lost. Read what the 10th Amendment says, it is quite clear.
Yes, the reason being is that California has attempted to enact restrictions that violate the Constitution of the United States. An example is below.

California violated the Second Amendment by disarming people based on nullified convictions
A federal judge ruled that three men who committed nonviolent felonies decades ago are entitled to buy, own, and possess guns.
