There is a constitutional way to remove people, and an unconstitutional way. When the unconstitutional way is intentionally chosen, the agency doing it is an enemy of the USA and we don't have due process to ensure individual rights are protected.

The 'entire point' of the thing of the government is to protect the rights of individuals in our borders, and all else falls downstream from that.

As for secession, I agree the states should have that right, however the civil war and subsequent litigation established that states have no right to secession.