Yeah, I've found "Symbiosis" to be rather jarring because at the end, Picard decides to withhold the parts to repair the ships because of the exploitative arrangement between the Brekkians and Onarans, even though he's aware that this choice will halt their space travel and offer only a "cold turkey" method of helping the latter off of felicium. But earlier in the episode, when Crusher says she can make a non-addictive form of felicium that could accomplish that transition easier and less painfully (if only as a starting step), Picard flatly refuses on the grounds that it would be a PD violation.
So it's wrong to take a practical approach when it would relieve mass suffering, but okay to just say we won't bother fixing your ships that are essential?

It's one of those episodes that had some genuinely good ideas but terrible execution.