The next moment he met Dougherty he informed him about his learnings. He was incarcerated on a Son'a ship and his next actions were to stop mass murder while he no longer wore a uniform.EDIT: You keep going on about right and wrong, but the fact of the matter is that Picard should've recused the Federation from the whole thing the moment he learned it was a blood feud. But if he'd done that, the Ba'ku would've been moved or executed and the planet stripped of the particles anyway. So Picard ignored the mighty Prime Directive when it no longer worked for him.
What's up Dougherty, I await the next cheap shot against Picard. Hurry up, you have little time before the authorities put you in jail or before your lovely allies stab you in the back.