A magazine featuring soft-lit cheesecake shots and articles on the latest guy-gadgets preaches harmful values?
You obviously never read the early "Playboy Philosophy" articles, which ran for years and preached licentiousness and consequences-free sexual license. These became bedrock values for a lot of impressionable young men, leading directly to the radical excesses of the '60s.
Playboy Magazine was more than just a skin magazine. It was a cultural phenomenon in the somewhat morally straight and innocent environment of the pre-Vietnam '50s and '60s which led "The Revolution", albeit in a soft-porn and highly hedonistic way.
Hefner has a lot more to apologize to America about than merely corrupting the publishing airwaves with airbrushed babes. His "sexual revolution" has borne a lot of bitter fruit. He led the fight against general morality and decency in America, the results of which we see daily.