I guess the problem with that argument is that it doesn't consider there are a variety of approaches to therapy that don't all work on some "core function".
Of course, Hank Green to the rescue once again!
Some therapy is designed to ignore deep trauma and rather focus on the most surface level things. We could go in circles all day about how 9/11 made you terrified of flying, but even if you found some answer, it wouldn't necessarily help. Instead maybe some exposure therapy or psychedelics or idk some other strategies can be used here and now.
I also think that even conservatives have differing worldviews within their own, so lumping it all together as a bad worldview doesn't work. Not all conservatives are angry and pissed off at everything and everyone. Not all liberals are the embodiment of enlightenment. When it comes to therapy, I think there is no one size fits all, and a conservative therapist may help a conservative patient in ways that a liberal therapist couldn't.