I think this debate is about the bigger picture, and what is perceived as normality, rather than one based on individual cases. The problem with womens' perception of themselves and their breasts lies with the media. People are more likely to see prominently displayed breasts in the media than in real life, and if there are a lot of cosmetic implants on display, it subtly starts alters the perception of a woman's body, and that it is normal to change your appearance in this way. It is basically promoting a 'look' and a fashion, and humans have been known to follow fashions.
In the past, people in the public eye were royalty, politicians, showbiz celebrities and movie stars, who were a bit different to 'normal' people. These days, with reality TV shows, anyone can have their 15 mins, and you now don't have to be rich/famous to benefit from the treatments only movie stars used to use - all you need is a credit card. Therefore, many publicity seekers look to 'enhance' themselves when appearing in the public eye, creating a particular look which others may find attractive and wish to emulate. The difference here though, isn't how you wear your hair, it's how your breasts look, and the more women there are in the public eye who deliberately disrobe and display their surgically altered wares, the more people feel that maybe that's how women actually look, and feel bad about their perfectly normal bodies. Young boys and girls seem particularly influenced by this.
It seems wrong to me for invasive surgery to be seen as a normal thing to do if you have money, as though it is a fashion, and not being taken on a case by case basis.
Basically, what is wrong is fake tits being flashed everywhere in magazines, music videos, tv and newspapers.