The adoration and preferential treatment is not natural in any respect and as any other animal can't, humans can't deal with the pressure. There are numerous theories behind this. One is that starlets can become so used to getting their own way that when Daddy doesn't buy them the moon, they feel as though their world has ended. This is particularly well shown in child stars such as Justin Bieber who, adored for all his puberty, adjusted well to life doing what he wants, when he wants, singing like testosterone is out of style and having millions of fans to worship the ground he throws eggs on. Hence his bratty attitude, hence his dumb behaviour, hence his arrest. Miley Cyrus too is somewhat a social phenomenon changing from sweet Disney kid to the gyrating, twerking porn princess: quite a violent contrast. Her dad originally cast her in the role of Hannah Montana in a little leg up the industry ladder, but I can hardly tell if he approves of her latest developments. I'm certain my dad would have a heart attack if I ever appeared on live national television dressed as a bear -with not a camel toe, but hoof- revealing an extraordinarily large tongue, especially since Daddy Cyrus's demure Christian music-past. However Billy Ray is not entirely sinless which his large host of love children can testify.
Other theories to the effect of fame blame the media for the constant scrutiny and pressure for perfection they put the stars under. It is an industry so subject to rumour that someone's reputation can be shattered beyond repair on a lie. It's this kind of stress that leads to the poor mental condition of many celebrities, for example the late Amy Winehouse. Her battle with the media led to problems with self-harm, depression and eating disorders as well as being hospitalised for overdoses on heroin, ecstasy, cocaine, ketamine and, of course, alcohol, the latter of which led to her death.
The media is a relentless force seizing whatever misdemeanours it can find and blowing them up to earth shattering proportions. It trains us to expect perfection from our idols in exaggerating their achievements, then leaves us shocked when it is revealed that they are only human, fragile enough to break beneath our pressure, leading to our celebrities dependency on drugs, attention, alcohol, relationships- ultimately leading to their break down- and whatever addiction takes their fancy this week.
Michael Jackson was another victim of the media saying "The media tend to want to twist what you say and judge you. I want to keep it on the music and the art." And he would be the expert after the lengthy false accusations of sexual molestation, all made by people seeking to take advantage of his fame and wealth, those people including a previously close friend and his sister.
And as you can see, ABBA got off lucky.