In the words of the conflicted comic superhero, Wolverine, back off bub.
That's what I say to everyone who is dumping on Andre Agassi right now. Especially former tennis stars like Martina Navratilova and Marat Safin. People are suddenly treating Agassi like a pariah for his admissions that he went through a time where he was clinically depressed and used crystal meth, a time when he didn't want to compete and tanked matches. I hear people talking about him saying "oh he's just trying to sell books and make money," while others, like those tennis stars, are crying that he should "give back his titles and his winnings."
Now, how do I put this delicately to all these critics and cynics? Both of those statements are idiotic. Delicate enough? All these people are acting willfully stupid and taking the petty opportunity to pile onto a man who has taken a huge risk in admitting his own flaws, his own shortcomings. It's another symptom of the dark side of the human condition. The bright side of the condition, of course, is that we cheer for the underdog, for the unconventional winner, which Agassi once was. The dark side is that we love to tear down those on top, which is how Agassi went out: on top of his game, married to a beautiful former tennis star, with a slate of titles to guarantee his placement among the game's all-time best.
The public's reaction now has nothing to do with what he's admitted and everything to do with his perceived status—a man with everything. People cheer for the underdog, but despise the winner (see: NY Yankees). It makes no sense. It's to say that I am going to pull for you and be with you as you climb the mountain, but the moment you reach the summit I am going to try to push you off. It's backstabbing, it's mercenary, and it's the way of most fans (and apparently some athletes).

Agassi the Younger, before depression, divorce, and crystal meth.
Let me answer each of the critics two biggest complaints here.
First criticism, the complaint: he's just trying to make more money. Rebuttal: Agassi already has money. He still has endorsements, he has businesses, and more than likely was getting paid handsomely for speaking engagements. Money is not what this man needs. If anything he wrote this book knowing it was going to hurt his income. Who wants to pay a guy $20,000 for a speaking engagement if the guy has admitted to doing crystal meth?
Bottom line: This criticism is an ignorant and knee-jerk reaction. We've been conditioned by celebrities to expect that they're hiding something, and that when it does come out it's something so terrible that it's hard to forgive. For athletes, that usually means performance-enhancing drugs or domestic abuse (or, you know, nearly severing your ex-wife's head with a knife). Agassi's terrible confession: he was depressed. Get over it.
Second criticism, the complaint: he should give back his money and winnings for lying to tennis. The rebuttal: This one, honestly, would be laughable were it not so ridiculous. Give back his money and winnings from what? From the period in his life when he was depressed, doing meth, and not wanting to win. Maybe people just don't understand so let me explain. Andre Agassi was depressed, he has even said that the worst feeling in the world to him at this time was the idea of winning and having to play again the next day. He wasn't winning, he was losing! And even if he wanted to win he couldn't because he was on meth! Look, meth is not what one would call a "performance enhancer." This isn't steroids he was on, this was crystal meth—a drug that has you tweaking for days with a racing heartbeat and a complete inability to focus. It's hard to do anything on meth, let alone focus on winning a match.
Bottom line: If anything these matches should be replayed! I'm joking, of course, but that's no more ludicrous than the suggestion that he return titles that have no bearing on this period of his life. He was depressed and on a drug that hindered performance. He wasn't winning, he was in fact doing just the opposite. He dropped from number one in the world to number 141. And then he managed a terrific second act by turning his life around he climbing back out of that personal and professional hole. He climbed from the bottom of the tennis rankings all the way back to the peak—to number one—and along the way he found true happiness with his current wife, former tennis star, Steffi Graf.
He should not burned at the stake for these admissions. Rather, he should be applauded for having the courage to make an admission with the complete understanding that it would not only damage his reputation but hurt his ability to make money (which is largely dependent upon that reputation).

Agassi the Elder, post-depression, -divorce, and -meth.
I, for one, defend the man and believe him to be a man of integrity. He compromised that integrity once, and it's eaten him alive ever since. When he played the game, at least when he played it right, with passion and to win, he played it fearlessly. He was also the best return man in the game. Well, that same fearless quality is what has allowed him to publish this book admitting his own faults. By doing so he put the ball in our court, and the public has served up fury and anger, but be wary of his service return—it's vanquished many an opponent on the court, and I don't believe he will just go away now that the public is forcing him to play a game for his reputation and his character.
Lastly, my advice is to stick with the old proverb, let he who is without sin cast the first stone. Perhaps, all you casting your stones at Agassi now do so because you're afraid to look in the mirror at your own faults. After all, if this once unblemished hero can have made such terrible mistakes, then what awaits in your own reflection?
Please, see the man for what he is: greatly humbled and trying to atone for the misdeeds of his past. Misdeeds, by the way, the he did not have to admit. This isn't baseball, and he wasn't on a list. He wasn't forced to admission. He came to the public, to tennis fans, and said, "Look this is what I did, I don't have to tell you but I want you to know, because you always deserved my best and I didn't always give it. For that I am sorry." He is prostrate and asking forgiveness, this is his confession. Be gracious in return, accept the apology and forgive the man.