The institution known as "school" isn't just a facility for doing classwork. It's essentially a microcosm of society, all of humanity put together in a little diorama. Bully exists in schools because war and conflict exist in the world, and school castes reflect our stratified, hierarchical society. Living in a democracy, the tyranny of the majority naturally applies at school, too. The majority -- that is to say, the people with the most friends -- are superior.
In the absence of any therapy, the mentally ill of the 20th century were chained, shackled, straitjacketed, kept nude, electrocuted, half-frozen, parboiled, violently hosed, wrapped in wet canvas, confined to “mummy bags”, subjected to insulin-induced hypoglycemic comas, forced into seizures with massive doses of the stimulant Metrazol, injected with camphor, drugged into three-week comas with barbiturates and tranquilizers, involuntarily sterilized, and surgically mutilated. Rape by hospital staff was common, as was humiliation and verbal abuse. One reporter noted that a state hospital patient had been restrained for so long that his skin was beginning to grow around the leather straps.
The term 'deinstitutionalization' conceals some simple truths, namely, that old, unwanted persons, formerly housed in state hospitals, are now housed in nursing homes; that young, unwanted persons, formerly also housed in state hospitals, are now housed in prisons or parapsychiatric facilities; and that both groups of inmates are systematically drugged with psychiatric medications.