Just to add i would say it's more like extradition. Like countries extradite criminials all the time and guess what, the countries take those murderers etc back in, sure it's to jail (not always) but krakoa didn't have any laws at the time thus there was nothing to charge those who were extradited and given immunity with and they started to build as they went, see sabretooth. But some things are all in how people want to perceive them.