I remember reading about a study of the number of traffic fatalities. apparently, the study did not find the predicted positive results of anti-lock brakes.
A possible explanation was that people have been reflexively hitting the brakes and swerving. Before anti-lock brakes, the hitting the brakes locked up the tires, so the swerving was ineffective, and you’d have a nice, clean front impact.
After anti-lock brakes, the swerve actually happens, and there were enough fatal roll-overs and side-impacts to negate the other accident gains from anti-lock brakes.