When the Foundation gets in a new object, they don't have much info on what exactly it can do, but with sapients would they place more value on studying their mind-set or just getting as much physical data as they can? Obviously things like 082 probably wouldn't be considered much, as he is clearly a lost cause and 682 is, well, self-explanatory. With all the things that seemed safe and turned out to be dangerous and occasionally vice versa, how risky would it be to the Foundation to send in a psychologist instead of a scientist? If the psychologist route is taken, what then? Offer it some sort of counseling or meds (provided they show good behavior and continue to do so), or just let them fend, stepping in only to make sure they don't hurt anyone?
The Foundation would do whatever necessary (and cost-effective) to contain an anomaly. Talking down the crazy guy who happens to also possess world-shattering power is a hell of a lot cheaper than expending huge amounts of ammunition to take him down. That being said, they're definitely going to have a hell of a lot of backup in case the shrink messes up.
It depends, I guess.
Given that SCP-321 exists, I'm saying the Foundation have no interest whatsoever in the mental welfare of SCPs.
Mostly agreed. When it comes down to it, when you have an anomalous entity, you don't know what they're capable of. Unnecessary cruelty is to be avoided, but in the end the foundation is never letting them go. Ever. They are not so much worried about the SCP object's comfort or happiness as they are in ensuring they are not a threat to humanity, and in understanding their properties.
However, their mental condition IS a factor when you have to consider whether or not lowered mental stability will make them a greater threat, or if comforts offered will make them more compliant.