"Rain Man" was based on a savant named Kim Peek.I could see Rain Man as a realistic presentation of some autistic people. With all those wild adventures after coming straight out of an institution, no wonder he had 3 or 4 meltdowns. With a gradual transition maybe he would not need the institution. Maybe he could just learn some coping mechanisms and he probably would need a legal guardian in his case.
"Unlike many individuals with savant syndrome, Kim Peek was not afflicted with autistic spectrum disorder. Though he was strongly introverted, he did not have difficulties with social understanding and communication. The main cause of his remarkable abilities seems to have been the lack of connections between his brain's two hemispheres. An MRI scan revealed an absence of the corpus callosum, the anterior commissure and the hippocampal commissure, the parts of the neurological system that transfer information between hemispheres. In a sense, Kim was a natural-born split-brain patient."
Kim Peek, the Real Rain Man.