Who cares about the 13th, if you think it was a bad anology fine, it doesn’t change my contention that ex post facto applies to perps, not victims. It applies to people being prosecuted for crimes prior to a law being enacted, not freeing victims of laws badly written.
Do you have any basis for that contention or are you just makin' it up as you go along? How about some support? So far, the Constitution seems to be working against you when talking about the powers of Congress:
No Bill of Attainder or ex post facto Law shall be passed.