"You don’t even know you’re on the edge of a cliff"

From Borenstein's Law, a gripping tale of a young man about to break his parents' heart:

Intervention: what friends are for

And yet here he was. Sitting across from me, smiling a benign smile, seeming oblivious to the decision he was contemplating that might lead him on a disastrous path...

Read all the way for the startling conclusion.