I am torn on the issue to be honest. On one hand, since psychic abilities seem to work by willing things to happen, there is a chance that becoming proficient in the mind arts would allowus to break other types of mind control, such as Dandeer's or that of other psychics. That is reason enoughto learn this since we are looking for ways to free our people from Dandeer and learning to attack people's minds seem like the obvious way to break mind control.
On the other hand, this guy is not yet planning to sell us out, just noting thathe could get Bassoon to pay him more to keep quiet. If we attempt to mind control him and he later breaks free then depending on when he does he might just give the information out of anger which might be troublesome if we are still on the planet. For the mind control to be useful it needs a prolonged effect which is similar to Dandeer's thing.
Now, what I am to say now may be a bit controversial but I think I have a compromise. We are trying to get to Namek to save it so the means we employ should be decided by giving priority to said goal.
This guy wants more money. Does Bassoon actually have enough to pay him and buy the fuel? If the answer is that silence money plus fuel is more than Bassoon can pay, then we have to silence this guy either by a) killing him (not something we can do as per protector trait) b) kidnapping him until ee have the fuel (impractical since we only have 1 body), c) threaten him (obvious bluff since he can tell the refugees as soon as we leave the bar) or d) use psychic powers. For the psychic powers we can outright order him not to (too much like mind control) or leave a suggestion that no, we probably are not the guy the refugees are looking for since he doesn't know for sure yet.
On the other hand, if Bassoon does have enough money, even if he ends up broke afterwards, I say we pay him. We can make more money with odd jobs along the road as soon as we are out of sight of the refugees. We should still keep checking his thoughts to see if he does intend to keep quiet if we pay him. If he doesn't, we could try to make the order for him to keep his part of the deal. Kind of like using mind control powers as a geass or magical contract to keep people honest after reaching an agreement with words. So something like:
[] Inform Bassoon about what the guy is thinking about. Ask him if he thinks he has enough money to pay the premium.
-[] If he doesn't, try to use your powers to convince the dealer that he has the wrong guy. If he does, continue with the negotiation.
-[] Read his thoughts as the negotiation goes on to help Bassoon haggle by checking what the smuggler thinks about what he is saying.
-[] Once the deal is done, check his mind to see if he intends to sell us out to the refugees despite being paid not to. If he does, plant the suggestion that he honors the deal.
@PoptartProdigy
Edit: Just to be clear, I am not opposed to learning the skill but for something like mind control I would rather we practice on informed volunteers. We could probably convince a few Namekians to let us practice on them if we save their planet.