The problems with his argument:
* While it's true a spinal cord cannot be repaired, he never engaged with rehabilitation to improve his situation at all.
* His main problem was depression. He assumed it was caused by the accident, and so didn't bother to treat it. But millions of physically healthy people suffer from depression and kill themselves too. And some very disabled people don't suffer from depression.
I was left thinking that while it may be nothing would have helped, we just don't know. His friends, family and doctors let him down by not forcing him to undergo rehabilitation and psychotherapy.