Earlier quoted context omitted.
Effectively they are giving drugs that alter ones perception of reality Like over the self painkillers do? Personally I don't see the philosophical difference in alleviating physical pain from alleviating psychological pain. Of course, if the psychological pain is caused by a condition that can be fixed the fixing the condition itself is of course better. But in many cases of depression and anxiety there is no clear…
Painkillers are temporary. The drugs we are talking about are meant to effect a permanent change on the user. And pain killers, at least OTC ones, don't alter someone's psyche. We can, more or less, rely on their judgment that painkillers are helpful. You can't necessarily say the same for mind altering drugs.
You'd only say someones judgement about themselves is unreliable if they will contradict themselves later. But if it is a permanent change, then you are talking to the "new" person who is capable of judging this as well as anyone.