Oddly, I have just come across a historical example of the "abstract" LPF defense mentioned in the above post:

"(2) In the trial of the LPFers, the defense counsel explains that because Araminta law does not allow human habitation of Lutwen Atoll (Yipton), therefore there could be no victims of the LPF attack...."

In 1784, a Connecticut court ruled that black veterans of the Continental Army could not be re-enslaved by their masters, because the Continental Congress had passed a recruiting regulation that only permitted enlistment by free blacks. Thus, since there could be no slaves in the Continental Army, all veterans must be freedmen.

People go to special schools to learn to think this way.