"There is no crueler tyranny than that which is perpetuated
under the shield of law and in the name of justice." Baron de Montesquieu, "The Spirit of the Laws", 1748.
It seems the business of slavery in the United States has just found another form... Detention of immigrants had become spectacularly lucrative, and to keep the revenue stream flowing, someone, somewhere, allegedly had to keep the right officials smiling.
However, once the BIA issues negative decision over your case, the order of removal becomes final immediately upon the BIA’s decision, not after a 30-day grace period allocated for appeal. So you need a judicial Stay of Removal.