Goodness, some of the replies on this thread are absolutely astonishing in their callousness and, quite frankly, ignorance.
Certain posters are pointing to the fact that this man was already an adult rather than a child at the time of treatment, as though that proves he is entirely to blame for what happened. This point of view fails to recognise one of the major reasons as to why a child receiving this treatment would be/should be so outrageous - because children are categorised as 'vulnerable'.
Children are not the only section of society that are 'vulnerable', many adults can also be classed as 'vulnerable' whether due to physical, emotional and/or mental conditions.
This is why the phrase "of sound mind" is associated with will writing, to ensure that the adult bequeathing their estate is not being forced or coerced into writing something they either don't mean or don't understand. This is also why decent plastic surgeons are expected to require a psychological assessment of their potential patients prior to aesthetic procedures, e.g. rhinoplasty or breast augmentation.
Medical professionals have a duty of care to their patients that includes not performing unnecessary procedures on vulnerable individuals that may not be in a fit state to make an informed decision.
As to the comments about why the man is suing for money rather than a promise to not perform the same treatment on others - the latter suggestion is frankly nonsense and would never be upheld. We live in a capitalist society, money talks (in fact that is why the lobbying by the likes of Stonewall has been so insidiously effective), so suing for money is (obviously) an attempt to create a disincentive for future treatment of the same type as it establishes the threat of more money having to be paid out in the future.