As his mother stated, he was on a ventilator, artificially keeping him alive and was not responsive. Perhaps he could have been weaned from the ventilator to breathe on his own.
As far as his medication expense, I know people who spend more than the $399 per month @ $13/day which his medication cost. If he had epilepsy, this may have interfered with his working.
All in all, a sad day for his family, but no cause to place blame. I think it was his time to go.