It's common in FE games for deacons to go insane. However have you ever wandered why it happens?
What we know about the 'dragon condition':
Seems like every dragon eventually goes mad;
It's not exclusive to divine dragons, as Anakos goes insane as well (and he was an astral dragon);
It's not exclusive to male dragons either. In FE3, Tiki mentiones that she sometimes has an urge to go on a rampage, what can be seen as first simptoms of the condition;
Despite his age, Morva from FE8 seems not to be suffering from the illness;
Duma did go mad, but Mila and (especially) Naga seem to be completely healthy and sane;
There are young dragon around, but they never mention the illness nor seem to suffer from it (exception being probably Tiki, as mentioned before);
There is no record of dragons going mad in the previous generations of dragons (for example it is said that they coexisted peacefully with humans on Elibe);
Some dragons are aware that they will eventually go mad (Mila, Duma);
Dragons can be stopped form going mad by performing certain acts (Azura's song easing Anankos)
What is happening here? What is the source of dragon madness and why is it so selective?
Does somebody have any ideas?