In theory, the Framers did. The Bill of Rights was not a dictate to the states, but rather a limit on the new federal government. Of course, while the states were free to do as they pleased, the Framers expected that they would already have those protections in place. It was the federal government which was the Framers feared would take away our God-given rights.
And Illinois’ Constitution did that by re-stating the 2nd Amendment almost verbatim.
But, then there is the “home rule” clause for cities.