I’m 99 percent sure that even going by that person’s evil and legitimately idiotic logic (I don’t mean this in an ableist way, though I apologize if someone takes offense, and I am neurodivergent as well), that even when Hitler was happy and possibly lucid, he had no doubt planned the Holocaust for years at least. That isn’t quick non-premeditation, the Nazis definitely planned this all in advance. Some drugs wouldn’t prevent Hitler from enacting out genocide.