Freeborn and Freeborn to a different world than had his father still been a slave. If the Hutts had controlled Tattoine as they had when Anakin had been a boy. Luke wouldn't have been a Skywalker, but a Naberrie. No one would have risked Luke having that last name. The Hutts would have put too many bounties on him, to enslave him too.

Vader had seen it happen, more than once. Sometimes it ended in death. Or multiple ones.

"Why can't they? It depends on the leadership."