Because street and prescription drugs used abusively do a fine – short-term – job of distracting the sz patient from his or her voices, intolerable emotions, etc.? (One need only read ancient Greek plays to see that alcohol was widely used to “treat” depression, anxiety and “madness” 2500 years ago.)
That was me for decades, bro. When they finally got the dx right and pasted a yellow sticky note on my forehead that said “Bipolar with Psychotic Features,” I didn’t argue for a second. (But it still took the “king’s men” several years to put Humpty Dumpty back together with meds that actually worked. And it was a woman from India who did it.) (Thank Krishna.)