I unfortunately know several boys and girls who went OTD and every one of them was from a Yeshivishe family. I am sure many people know MO families who have kids who went OTD. The bottom line is kids go OTD, and instead of playing the blame game, we need to identify and understand the reasons why this happened in each case. There is plenty of blame to go around.
My friend’s brother had a rebbie who smacked him. He might even have deserved it, but that was not the way to handle him. A girl I know was very frum and had a serious problem that she took to her yeshivah principal, who promptly called her a liar. She is now totally OTD and probably will not be back. One kid “frummed out” in E”Y (MO family), and he flipped in and flipped out, after putting his parents through a terrible nisayon. There are a gazillion reasons why people become frei. The one thing I see consistently, is they react to hypocrisy and judgmentalism in a very negative way. Also, if you want to hold onto a handful of grains of sand (or kids), relax your grip. The tighter you pull, the faster they run out on you.