He suffered horrible life altering injuries, losing an arm and a leg and undergoing numerous surgeries. I doubt he sees himself as "lucky". He got drunk and did something really, really stupid. Whether the platform area should have been more secure or whether Amtrak and the MBTA have some liability in what happened, that will be for the jury to decide (or for the parties to settle).He survived, as far as I see it he's a lucky man. Booze can make you survive just about anything. ^_^
As for the suggestion that he should sue Yale for not teaching him about the dangers of getting drunk, Yale does have far deeper pockets than Amtrak with a $35+ billion endowment. But I would venture that Yale does have posters and safety programs advising students about the dangers of heavy drinking which probably give them a degree of protection from such lawsuits. Which of course is a reason to have such safety educational programs. If he were to sue Yale for not teaching him about the dangers of getting seriously drunk, on those grounds, he could possibly sue his parents, his high school, and even his friends for not either warning him sufficiently or not stopping him from getting drunk and getting hurt. Which probably not get very far in court...