I always saw it as them fighting to be whole. Specifically apocalypse tells Melody she could walk out of there and live a human life and no one would judge her for it. So in my mind a depowered mutant that wants to remain depowered would essentially be considered human which is why Melody had to apply for it. So let's say someone feels their friend is suffering not being whole, well killing mutants isn't a crime so what is stopping some mutant from going on a rampage to speed up mutants being brought back by killing depowered mutants. I always figured it was the first law. Which now given this issue and magneto vehement defense of it against cortez in a previous issue, i feel he was behind the law because no one could take vengeance on wanda while it stood because she is considered human.