We make decisions everyday that could potentially kill us. People make far dumber decisions in the backcountry time and time again and not only live to tell about it but don't even realize that what they're doing is stupid.
It only takes one mistake. Not just in the backcountry, but in many situations we find ourselves in everyday - like your yellow light example.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz