Hey everyone
very first message here so I hope I do all right.
One of the recent recurring themes of the show being 'free will' (or the illusion of it, as I'd like to call), I think Juliet's tape could well be part of the act she arranged with Ben, to get Jack want to perform the surgery. Having found out about Juliet's murder plan (I don't like her a bit), Jack would be all the more willing to become the 'life-saving hero' he is (no offense Jack-lovers) , do the operation in the hope of finding a bargain for Kate and Sawyer out of it (of course he would refuse to be the killing hand) and alas , end up doing it 'at his owned (fooled) will.