This game gave me the benefit of the doubt, If you wait past the end game credits Booker wakes up in his office with a baby crying in another room. You can open this room, and then... bam, black screen, no answers for me, only doubts and theories. My best explanation is that Booker was resurrected from being drowned, just as at the beginning of the game during his baptism to get into Calumbia.
This game fucked my mind and twisted my heart, made me want to slap the shit out of Booker during most parts of the game, though still, I feel horrible for this man and his endevers.
5/5 for your reaction and 100/5 for Bioshock Infinite.