In the white guilt rationale if some of the states did not want to join the union in the first place and did not join the union, Washington would had threatened them with war and MADE them join. It was a voluntary union of states. If not, the Founding were a bunch of a lying SOBs who never had any intention of EVER letting a state out once they opted to join. If anyone believes that I’ve got some good ocean front property in Arizona to sell you.
You have such a simple-minded view of the world. Does it hurt?
If you had ever taken the time to actually read any history of the constitutional convention you would have seen the agonizing that was done over the invention of a government created from whole cloth. Every interest, every fear was debated and considered. Many interests were adopted, many rejected.
In the end the issue of leaving the union was left unaddressed. The representatives knew that and knew that their only choice was to accept the constitution as is, or walk away. They all accepted it - reluctantly or otherwise.
Why? Because they knew that the alternative was unthinkable. Going it alone meant being naked and alone in a den of wolves. No one state - no matter how strong - could survive it. They would get consumed, or subsumed - or they could join the relative safety of the republic.
As for “letting a state out once they opted to join” I stated my opinion upstream. Although secession isn’t an enumerated right, there is no reason why a state couldn’t petition for secession.