Not autist, just a race car engineer. The short answer, physics.
The F3 car, form fitting unpadded seat, proper six point restraints, helmet, Hans, Carbon fiber driver cell, energy absorbing crush zones (both car and barriers), and on. Extremely meticulous design and maintenance by the best.
Limo. Big box filled with bits made from pine 2x2's and pretty brittle plastic. Crap seats, sitting sideways, no restraints. In this case no brakes.
Would you rather fall six stories into an air cushion, or into a dumpster full of sharp and brittle bits with more people falling on top of you?