From the Constitution of the Confederate States; March 11, 1861
Sec. 9. (4) No bill of attainder, ex post facto law, or law denying or impairing the right of property in negro slaves shall be passed.
Sec. 2. (I) The citizens of each State shall be entitled to all the privileges and immunities of citizens in the several States; and shall have the right of transit and sojourn in any State of this Confederacy, with their slaves and other property; and the right of property in said slaves shall not be thereby impaired.
Sec. 2. (3) The Confederate States may acquire new territory; and Congress shall have power to legislate and provide governments for the inhabitants of all territory belonging to the Confederate States, lying without the limits of the several Sates; and may permit them, at such times, and in such manner as it may by law provide, to form States to be admitted into the Confederacy. In all such territory the institution of negro slavery, as it now exists in the Confederate States, shall be recognized and protected be Congress and by the Territorial government; and the inhabitants of the several Confederate States and Territories shall have the right to take to such Territory any slaves lawfully held by them in any of the States or Territories of the Confederate States.
Is this what you're in favor of?
So your argument is this: "Because those people are bad, they give up their right to independence as articulated in the Declaration of Independence.
Well the Union was bad too. (I know, tu quoque.)
Article IV, section 2. Clause 3
No Person held to Service or Labour in one State, under the Laws thereof, escaping into another, shall, in Consequence of any Law or Regulation therein, be discharged from such Service or Labour, but shall be delivered up on Claim of the Party to whom such Service or Labour may be due.
If you aren't grasping it, it means fugitive slaves must be returned to their masters, and it is a constitutional law of the *UNION* constitution.
So by applying the "they are bad" standard, does this mean the Union had no right to separate from England?