an evolutionary perspective [...] helps us understand why sexual transgressions by successful males, as well as the seemingly irrational levels of moral outrage at those transgressions, are both "natural," regardless of whether you personally feel that either is intrinsically good or bad.

Finally an intelligent comment about the moral condemnation hysteria of Tiger Woods.  Evolutionary Theory by Kurzban and deScioli

Men fantasize about novel women. Rich powerful man can actually get them

Tiger is a man with immense wealth and social status. Throughout history, men with wealth and status have tended to trade it for access to multiple mates. Evolutionary historian Laura Betzig has documented this pattern in modern societies and throughout history, as in the abundant cases of Roman emperors, Indian maharajahs, Arabian sheiks, and Chinese mandarins. Bhupinder Singh, the wealthy and powerful Seventh Maharajah of the state of Patiala, for example, had 350 wives, and he by no means held the record. European and North American states tend to be officially monogamous, but of course they are unofficially polygamous as well. Rock stars, famous athletes, politicians and even television evangelists are reliable sources of public outrage, which fires up every time we learn about their frequently overactive private lives.[...]

Kinsey found that the typical male masturbated with some frequency, during such activities men often fantasize about novel women. What if the man was sufficiently attractive that those fantasy women were actually ready, willing, and eager to turn desire into reality? The average heterosexual man would, under those circumstances, perhaps act like the average homosexual man (who is unconstrained by a more selective target audience), or like the average rock superstar: he would take hundreds of partners.

Psychology Today. December, 2009. Kenrick, D. T. “In "Defense" of Tiger Woods, AND of his critics." [link]

Moral outrage keeps others in check. So powerful men don’t monopolize too many women

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