That seems like a Freudian theory of repressed trauma or the more general idea of "coping mechanisms" that go wrong. The "healthy" mind isn't afraid/ashamed to hear and process discomforting thoughts. For the more fragile mind, pushing them back makes them more and more intrusive. Ronnie Laing, Thomas Szasz, Erich Fromm, and many others have said, variously; "Mental illness is a sane reaction to an insane world", "In a mad world, only the mad are sane", or "Coping is making yourself part of the problem".

That's not the same as being dismissive about the state of world, or legitimising/glorifying real and distressing medical insanity - it's just saying; be careful how you "cope". That said, just look around you. Aren't intrusive voices just reason tired of us telling it to shut up.