The ADHD Fantasy - posted once more

Here is my original post on the ADHD fantasy, reproduced in its entirety:

From time to time I point out that the complaint known as 'Attention Deficit Hyperactivity Disorder' does not actually exist. Invariably, I then receive a wave of letters and e-mails from parents of children who have been 'diagnosed' as suffering from 'ADHD'. These letters are all remarkably similar, and many of them are bitterly personally abusive.
In this entry, I shall take, piece by piece, such a letter, and seek to...