There is a difference between withdrawing from a political structure which was never assented to and one which has been legitimized by the People. All the difference in the world. It is a vacuous argument, laughable in fact.
“There is a difference between withdrawing from a political structure which was never assented to”
That claim can’t survive the Olive Branch Petition that the Continental Congress sent King George on July 5, 1775 after fighting had already erupted.
They weren’t simply assenting to the King’s government, they were pleading with him to reconcile with them.
They clearly state that they remain obedient and loyal subjects of King George and that they do not desire independence.
It didn’t work. George rejected their pleading and issued his Proclamation of Rebellion calling out the traitors in words that Lincoln would echo 90 years later:
https://en.wikisource.org/wiki/Declaration_of_Rebellion