Pretty disturbing footage right there. I can count more than a half dozen definite fatalities, at the very least.
As a racer, I have a lot of appreciation and gratitude for those before me who demanded better driver protection and safety measures. Jacky Ickx and Jacky Stewart come to mind immediately.
Racing back then was fun and daring, and no one gave a lot of thought to the danger involved... at least until they burned to death or were crushed by the race car they had just been thrown from at high speed.