Normalizing multiple personalities

With movies like Split, celebrities like Rosanne Barr saying they have multiple personalities. Popular youtubers having multiple personalities. This is how people are mind controlled. It was exposed experiments using multiple personalities to activate an assassin personality, or an obedient personality to create sleeper agents. This is what it reminds me of. This is certainly being used to mind control the masses by breaking their minds and reshaping it to what they want.