Robert Maxwell wrote:
Imagine the Federation helped the Son'a relocate the Ba'ku, made them all mortal, took the radiation, doomed the planet, and dumped the Ba'ku off somewhere else. I wouldn't be surprised if a disgruntled Ba'ku showed up on Earth a few years later to blow himself up in the Federation Council chamber. That's what happens when you team up with bullies and despots because it's politically expedient. The little people you step on get pissed and will come back to murder you for it someday.
Or worse the disgruntled Ba'ku talking about how the federation's safety is an illusion while crashing starships into San Francisco and trashing the freaking Enterprise while claiming to be better at everything than its captain.
Or another worse thing that could happen the disgruntled Ba'ku implodes a federation planet with a black hole bomb.
But if the Ba'ku hadn't given the S'ona, who wanted to be explorers instead of farmers, the short end of the stick a century prior this likely would've never been an issue to begin with.
They gave the Son'a the short end of the stick for trying to take over the colony and it didn't sound like the nice democratic way of doing it considering the Son'a went around enslaving people after getting exiled.
Hell for all we know the original plan was that the Ba'ku either expected the Son'a go off for a few decades get bored and then come back and apologize for the coup and everything goes back to normal or they just get used to being mortal and don't give a crap about their planet anymore.