What I said was: The Constitution grants great autonomy to the several states. Maybe I should have said, a great deal of autonomy. Virtually all criminal law, not directly impacting Federal interests (espionage, mail fraud) is handled by state governments. Murder, assault, and their prosecution being examples. Some states have the death penalty, some do not. Some, like Connecticut, rarely employ it.
If voters in the several states do not want to get punched in the face, they should know better than to vote Democrat. Good and hard.
The Constitution does not “grant autonomy to the states”, several or otherwise.
The Constitution enumerates the powers delegated to the federal government.