Pardon me for the stupid question, but how is bringing the speed down to 0 milliseconds before landing by firing the rocket thrusters different from just letting the capsule hit the ground? I thought the thrusters were there to make the passengers not feel the inertia due to sudden arrest of speed from 16-17mph to 0mph. Firing the thrusters milliseconds before landing seems to have the same effect as just letting the capsule hit the ground? Or is it to protect the capsule itself?