Look, if Art 1 Sec 8 wasn't enough for you, nothing else will be.
To exercise exclusive Legislation in all Cases whatsoever, over such District (not exceeding ten Miles square) as may, by Cession of particular States, and the acceptance of Congress, become the Seat of the Government of the United States, and to exercise like Authority over all Places purchased by the Consent of the Legislature of the State in which the Same shall be, for the Erection of Forts, Magazines, Arsenals, dock-Yards, and other needful Buildings;
Don't just read the part you like and discard the rest. There are no "forts, magazines" nor anything else being built on this land. BLM is just making it off limits to any use not associated with some Socialist/Left-wing agenda.
Something you seem to be fighting awfully hard to uphold.
Think about which side you are on here.
And you are unwilling to accept the fact that “for the erection...and other needful buildings” is a clause that describes what may be done rather than a limiting clause that prohibits any other use.
Since you are fighting so hard to assert the collectivist or squatters rights and are fighting so hard to abandon the rights of private property owners to use their land as they see fit, I can only assume from your arguments that you are a socialist and a Marxist. As such, we have little to no common ground. Further since you have failed to refute any of the facts, it makes no sense to spend further effort in any attempt to educate you.