“I dont know the law in regard to a guilty plea.
However - the Constitution says our rights are unalienable, which means we cannot renounce our rights, even if we sincerely want to.”
That is NOT what unalienable means. People can and do waive their Constitutional rights every day in all sorts of situations. Society could not function otherwise.
You have confused “inalienable” with “unalienable.”
The Constitution speaks of “unalienable” rights.
Unalienable rights are inherent in every man, granted by the Creator.
They cannot be surrendered except under lawful punishment.
Flynn was coerced, by threat of a prison sentence, to surrender his right to appeal and to introduce new evidence.
No American can surrender his right to due process and a fair trial.