And that was in the early 1970s, where crashes were much more common.

The first crash of the 777 occurred 15 years after it was launched with 1500 aircraft delivered, and even in that crash foul play is suspected.

The first crash (ignoring hijacking) of the 767 occurred almost a decade after it was launched, and the second was almost two decades after launch, and it's still not clear if it was suicide.