John Milius — hired by George Hamilton to punch up the screenplay in 1970 — remembered a darker side of the man he was dramatizing. When Milius brought the new script to Evel, he found Knievel not merely a publicity machine but someone who used lines from the movie as a template for life. Milius bluntly called him "kind of a sociopath," recalling that Knievel could be magnetic to youngsters one minute and explosive the next. Milius pointed to a specific violent incident — Knievel taking a baseball bat to a man and breaking his arm — which Milius says essentially destroyed Knievel's fledgling toy business and helped cement the daredevil's public image as both heroic and menacing. That volatility shaped how the film was shot and how George Hamilton inhabited the role: the movie leans into Knievel as a showman warrior and a dangerous man, a duality that followed the real Knievel into headlines and later self‑mythologizing.
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