You can give some of the credit to Ford's marketing machine. All of the corporate spewing of the race result most often said "Ford wins Le Mans". BS. I'm sure few of the "short attention span generation" really know or sadly care that was a falsehood. Hyping the ''historical'' result helps hoodwink the uneducated masses and create a more , um, "history" surrounding the current version of the event.
Give Corvette their proper due for not spreading this sort of crap over their many class victories.