What actually happens when a rapist is spotted or caught by the public can be hard to assemble statistics for.
I knew a woman who recounted her story. This happened in rural France, some time maybe in the 1960’s or 1970’s. She knew who the guy was, and told some friends who told some friends. A “posse” formed and went over to the accused (and guilty) guy and beat the living daylights out of him. They then warned him that if it happened again, they’d kill him.
The law never heard anything about the rape or the beating.