Back in the '60's, I remember Phil telling me of the huge differences at Le Mans, where, on the Mulsanne Straight (before the kink was put in it) he'd be traveling in the rain at >180 mph, passing little index of performance cars like the DB Panhards which couldn't even reach 100. But, there are rules that the drivers MUST follow if they are driving the underpowered cars, and the fast cars must be be given the rights of way - only in this way can the racing be safe for BOTH - and all drivers. Yes, it is dangerous, but racing will always have inherent risks that must be accepted by the participants.
Remember, in the 60's, the Mulsanne Straight was lined on the left by trees, there was no ARMCO at the Nürburgring, and these were considered the safer tracks. The dangerous ones were the Targa Florio (regular roads around Sicily), Monza which had a terrible surface, and Spa where it could be clear and sunny at one end and a major thunderstorm at the other - on the fastest F1 circuit.
Racing has changed for the better today, as it is much safer for the competitors, and the organizers continue to make improvements - such as the collapsing walls at the Indy-Champ Car events. But let's not forget that there are inherent risks that must be accepted.