Picard offers to have his forces stand down and recall the Enterprise
only if and when Ru'afo releases him and the other prisoners he's taken.
Ru'afo didn't tell anyone about the Sona's relation to the Baku because if he had then Starfleet might have refused to assist him for exactly the same reasons that they shouldn't be assisting the Baku. Until Starfleet forces sided with the Baku it was to the Sona's advantage to keep it a secret. Plus, as you already stated, he's nuts.
This isn't rocket science.
One guy having an issue with the situation suggests that there may be others, who perhaps would need less of a bitch-slapping, especially since Picard had already swayed one of their number.