My theory is that since COVID, the bar for how shitty/unprofessional a driver can be and continue to be employed has gone down significantly due to a severe and worsening shortage of drivers.
I know of one driver with 11 points on their license and zero class 1 driving experience that was hired by a reputable company recently. Another one with a rather fresh 2 month suspension and bunch of points got hired by a very reputable company too. Most companies used to want clean record, shady ones would be ok with 6-9 points. Now it's a free for all.
I don't think truck drivers are getting the same caliber of training these days and there are lots of newbies. Too many trucking companies out there, if one goes bankrupt because of a accident like this a new one just pops up right in its place.
Accidentally leaving your PTO on and accidentally hitting the switch to raise the dump box, and not paying attention and not noticing your box is going up.