There was a lot of movement to gradually reduce the forces of that crash.
When Senna crashed there was one sudden shift it direction. That's what kills.
The impact did not kill Senna. An equipment malfunction occurred sending the right tire assembly through his helmet for shit sake...those cars and safety equipment are meant to be safe in MUCH worse crashes than Senna's.
He hit the damn wall at a very wide angle..not head on. More like side swiped. Guys crash like that daily in racing and they do not even have a bruise.