No I generally don't bother with this sort of youtube stuff so I watched about the first 10 minutes and it was clear what the real issue is.
If you have an older Winchester 70, lee Enfield, BRNO 1 or 2 or a Military Mauser
all without modifications observe how the safety works.
You will see that some effort is required to apply the safety and if you look carefully you will see that applying the safety retracts the striker assembly somewhat.
So pulling the trigger while the safety is applied means there can be no loss of sear engagement when the trigger is again released and the safety can be released with no fear of accidental discharge.
This is an example of good and almost foolproof design although that does not preclude faults being introduced by negligence or inexpert modification.
Now contrast this with the trigger block safety found on many modern rifles.
This kind of safety works by preventing any movement of the trigger. Even the slightest movement of the trigger will reduce sear engagement and in the right circumstances simply releasing the safety can produce an unwanted discharge due to the now dangerously reduced sear engagement.
In the video what was being demonstrated was that there was enough sear engagement to restrain the striker assembly but not enough to prevent even the slightest disturbance causing an unwanted discharge.
This situation can arise for a number of reasons.
Inexpert setting of the interrelated trigger adjustments being one, but wear and unfortunate buildup of tolerances being others.
The original Mike Walker designed twin sear trigger had less of a problem in this area but was not immune.
Now at this point I have to say that I don't have a particularly high regard for the Rem700 even though I own two older models. Briefly it is a combination of absolute cheapness of manufacture combined with a fairly impressive exterior intended to sell in the high medium price range.
Not having watched the video all the way through I don't know how it all relates to the trigger recall a few years ago.
Little wonder that Remington filed for Chapter 11 bankruptcy a few months ago.
As for the poor individuals involved you would now need the wisdom of Solomon to fairly apportion blame.
How much is the fault of the big money hungry corporation and how much is the fault of the operator failing to observe the most common safety procedures.
One further observation.
Again not having watched the video all the way through, is there any hint that the programme is a 'trojan horse' for more US gun control.