And again, "Watching a successful, spirited individual slowly piss it all down the drain" is exactly what O.J. did. The murders, as dramatic as they were, represented the culmination of events that contributed to his ultimate undoing. O.J. was 46 when he killed, and had not been considered a "monster" all those years before that. On the contrary, he was celebrated by all because of what was perceived as a transcendent grace, that his skills and appeal extended well beyond the field of play (where Tiger's ended, by the way, because of his wooden personality).
With the benefit of hindsight, we can see that neither guy is what we'd call a good person. Tiger hasn't killed anyone (though at his age, O.J. hadn't either), but like O.J., he's haunted by demons and has a dark side that people still seem hesitant to confront. If there is one thing that distinguishes one from the other during their "glory years," it's that O.J. was able to conceal that fact that he was, in fact, a jerk, while Tiger never was. If you paid attention, it was obvious pretty early on that he wasn't likeable and became easy to root against. It's great that he "democratized" golf and made it accessible to people who had theretofore never considered golf an option (though it's effect seems to have been temporary), but he was never someone whose personality made him easy to embrace. All the more reason why his "fall" wasn't a fraction as precipitous as that of O.J.