What does cruel and unusual have to do with this conversation?
So you accept the government's abuses of power as evidence that it's permitted? It's one thing to suffer it because we must, as even Jefferson and the Founders said in the Declaration of Independence, but to say it's OK just because they do it, to ever quit saying it is NOT OK even if they do it, is a level of submission I will not do.
Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen. - Samuel Adams, 1776
Huh? I have no clue what you're trying to say; do you? Are you suggesting that it's impossible for the Courts to exceed their authority; that if they do it that is proof it's allowed?
The Constitution allows for the arrest and imprisonment of criminals. It's very explicit. The power to do that doesn't come from the Due Process clause; it comes from 5th Amendment Grand Jury clause, not the Due Process Clause.
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury,
So, apply the test I told you to this clause. If Due Process was never mentioned, the Grand Jury clause acknowledges the government's power to hold criminals but requires that the government get an indictment by a grand jury.
Then the 6th Amendment acknowledges that the government is able to try a criminal and protects the accused by setting some limits on the government's authority:
In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and district wherein the crime shall have been committed, which district shall have been previously ascertained by law, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the Assistance of Counsel for his defence.
And then, in the 8th Amendment, the Constitution acknowledges that the government has the authority to punish convicted criminals but protects the convicted from cruel and unusual punishment:
Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted
So, locking up a prisoner, taking away their freedom to travel as you gamed it, is allowed by the Constitution, whether or not there's a due process clause. Since the government otherwise has the constitutional authority, then the due process clause requires that they follow the law and due process. In a criminal trial, that would include things such as discovery, disclosure, jury selection process, etc., and probably much more.
But Due Process didn't give the Government one iota of power or authority to indict, try, convict, or punish the accused; instead, due process ensured that the government gave the accused, well... due process.
Now that I've educated you on what Due Process actually is, tell how does the government, had due process not been mentioned in the Constitution as amended, get the power or authority to strip someone of the right to keep and bear arms.