What should count as a mental disorder is a very interesting and complex question. Merely being abnormal isn't enough, but even being abnormal in a way that is harmful to a person living a good life, if the harm is a result of how society reacts, isn't good enough either (consider that being a homosexual in some societies can get you killed or discriminated against/ostracized enough to cause a significant increase in the rate of mental disorders).
Asperger's is an interesting one to discuss as it touches on a mental difference that is harmful enough to cause people problems, but whose harm may be how society reacts to such a difference, and which may carry some other benefits. But the one I find more interesting (if for no other reason than how emotional it makes people and the recent changes made in the DSM-V) is pedophilia. If someone were to read the DSM-V, they would find that when someone has an attraction commonly called pedophilia, but does not act on it in a harmful way nor feel significant distress, then it counts as a (and I quote the DSM-V with the next two words) 'sexual attraction' instead of a disorder.
(And if you really like controversy, you should look up the original printing of the DSM-V which used 'orientation' instead of 'attraction' until it was redacted. I also wonder what the psychiatric difference between a sexual orientation and a sexual attraction is...)
Asperger's is an interesting one to discuss as it touches on a mental difference that is harmful enough to cause people problems, but whose harm may be how society reacts to such a difference, and which may carry some other benefits. But the one I find more interesting (if for no other reason than how emotional it makes people and the recent changes made in the DSM-V) is pedophilia. If someone were to read the DSM-V, they would find that when someone has an attraction commonly called pedophilia, but does not act on it in a harmful way nor feel significant distress, then it counts as a (and I quote the DSM-V with the next two words) 'sexual attraction' instead of a disorder.
(And if you really like controversy, you should look up the original printing of the DSM-V which used 'orientation' instead of 'attraction' until it was redacted. I also wonder what the psychiatric difference between a sexual orientation and a sexual attraction is...)