Maryz and Fanjo, I am happy to say, despite your sweeping assumptions, I do have a great deal of experience in dealing with children who have behavioural difficulties, including my own stepchild. Who his mother wanted to get a nice little label stuck on him, because he was out of control.
That label would have stayed on his records, and he would have grown up considering himself allowed to be the brat he was, because the doctors said it wasnt his fault, he had a "disorder".
Luckily, she decided that it would be better for him to live with us, and he is now a very successful owner of his own company, employs others, and is happily settled with a child of his own. He is the first to admit he was a little shit when he was a teenager, and he is determined his own child will not behave as badly as he did.
So fine, for those of you who want to allow your child to be tagged for life with a disorder that has only recently been created, go ahead. Then you can say they "grew out of it", which most will, because it is called growing up and realising that your behaviour is not acceptable and the world doesnt revolve around you.
I also have close family who have had serious mental health issues, as adults and children, who did need help, and who would have got more help if the services in place to give this help were not tied up dealing with cases of children who should not have had any sort of behavioural disorder put on them and should have just been disciplined more strictly.