Why was it in Kennedy’s interest to let her drown? Did he just like the thrill of murder or was he not supposed to be driving around with her late at night? Was he married at the time?
Marriage never stopped him from dabbling ... .
Come on. This is a KENNEDY!
If they’re not willing, rape is in order ... .
It runs in the family.
It wasn't in his best interest to let her drown, but Teddy was a married man leaving a party of several young single gals and a few older married men. I believe that Teddy drove off the bridge on the way to a secluded spot to put the Kennedy moves on Mary Jo. I also believe that Teddy was very drunk, unable in courage, mental or physical capacity to try and save her, so he deserted her, walking past at least four homes where he could have summoned help, and instead spent 9(?) hours sobering up and marshaling as much support as his political office and Joe Kennedy's money could buy.
I posted from memory, no doubt there are web sites that have the facts laid out more precisely.