how can anyone think that there is one reason for otd kids. as many people as there are there are different reasons for each. that beingsaid ,it is important for schools, parents and society to deal with children who have learning disabilities and help them feel that they are valued and valuable members of society. if society demands something of you that you are incapable of then you will leave that society and find another society where you don’t feel so bad about yourself.
Another issue is abuse. children who have been abused often leave the fold if the abuser was/is frum and wasn’t ostracised. who knows what these kids went through or still go through. sometimes it’s parents or close relatives who are the abusers.
May Hashem help all of these children return to the Derech, and may all of Klal Yisrael merit to see the Geula , b’karov.