One doesn't have to watch it to know what happened. People screwed around with the trigger. The result of screwing with the trigger is no secret and was common knowledge in the 60's and Remington made that crystal clear A little info ,you could never adjust a 700's trigger safely under 3 3/4 lbs without replacing a a spring that in the trigger mechanism for reliability and most would replace the whole trigger with an after market one.
We're talking a commercial rifle that over 3 1/2 million have been made ,not to mention the actions used in custom guns. It's not "damming " evidence but pure B.S.
Reminton would probably be using the same trigger in todays guns coming off the line if weren't for lawsuits from the abulance chasers and the anti-gun judges and politicians.