Let's get the snow day popcorn started...my take...
90% of OTD is because they cant reconcile their sexual activity with Judaism...1% is intellectual OTD and the rest is a mixture of reasons.
I think we should differentiate between reason, trigger, facilitating factors, and reaction (or lack thereof), which are all part of the OTD issue.
IMHO there is only one reason across the board. It is לנורא עלילה על בני אדם - ניסיונות!
When discussing triggers, there are quite a few out there. I don't think what you mentioned as 90% is actually of any significant number. Common triggers mentioned are: abuse (physical, sexual or emotional/mental), lack of Sholom Bayis, cognitive dissonance observed.
While there's absolutely no action anyone take about the reason (other than daven), and often we are very limited in controlling the triggers, we definitely do have the ability and tools to deal with the facilitating factors, and more so with the proper responses. And if applied in a timely and correct manner, it could help in most cases.
Regarding the story in the post, I would be totally shocked if there's even a 1% grain of truth to it.