Are New York sports teams cursed? Heh. When things go wrong people like to look for any possible explanation. But in retrospect, you could say there was the accretion of fate-tempting moments for the Yankees, including Sheffield’s boast and there were incidents such as Tom Gordon’s champagne eye injury. Celebrating too hard? Did this lead to his crap Game 5? And then John Olerud stepped on a bat, necessitating the use of Tony Clark… cue the Twilight Zone music.
Or you could say: the Sox won with Nixon and Nomar out for much of the season, the Pats have been winning despite horrendous injuries because Belichick is ahead in exploiting flexibility (a necessity in a salary-cap restricted league), and Danny Ainge is a better GM than Isaiah Thomas. Any “curse” of injuries is just business as usual - deal.
In a related question: can St Louis teams ever beat Boston? Not unless the St Lunatics take on the Made Men in a rap battle.