Loose a load and kill someone and they don't give you a mulligan. No do-overs. No second chance to do it right the first time.
I hear oh so many people talking about "I drive just a bit slower and take my time when hauling a tractor". Or "I'm a safe driver". It's not always YOU that causes the wreck that flings your pride and joy onto someones car. There's always that imbecile in the suv that cuts you off changing lanes without warning, or the teenager who pulls in front of you and slams on the brakes to make an unsignalled turn. And what about that unexpected chuck hole that slams your trucks suspension beyond it's limits. Saftey isn't a game.