There was no reason for Sutherland's character to "flatline" twice.
They all were medical students so atleast someone should have identified the deep psychological effects flatlining caused and take them to get treatment at a mental health institution or something.
I didn't see any reason for Kiefer Sutherland's character to flatline again to "make his amends". That was just crazy. He clearly needed therapy and medication for his condition. I mean the guy was severely self-destructive.