This wikipedia article so eloquently tells what I could have tried to explain about the safety at the track, the handling of the williams after the driver aid ban, the dirty politics of keeping the body alive, etc:
http://en.wikipedia.org/wiki/Death_of_Ayrton_SennaI'm interested by the statement that had Roland been declared dead as he should have, the weekend would have been cancelled, saving Senna's life.
Adrienne saw the crash live in Sao Paolo and then was called and asked to come to bologna. I can't imagine the feeling that must put in a person.
Several drivers had in the past crashed at Tamburello. Berger even broke his neck there. After the 1994 race, it was changed to a chicane.