I worked for a big manufacturer for a while and every year at the company wide safety presentation the CEO would tell a story from when he was a plant manager. Someone climbed into one of the machines to do to maintenance on it without following lock-out-tag-out procedures. The machine kicked on and the guy was crushed to death.
The CEO would kind of wrap it up with, "I want all of you to go home to your families at the end of the day and I don't want any of you to ever have to call one of your employees or co-workers family to tell them that their dad/mom/SO is never coming home again because of one little mistake."
I've been around an astonishing number of people who don't take safety seriously. I've been very lucky but I've had more close calls than I would like. All it takes is one time.