"And, let's not confuse homosexuality and pedophilia"
However, the highest percentage of pedophiles are also homosexual, so there is a definite correlation that is very hard to deny. I think Foley was going through the homosexual version of mid-life crisis, when X amount of men go off the deep-end and try to somehow regain what they see as their lost youth. Foley fits this bill, both by age and by action.
The second part may very well be true, but we simply have no way to conclude one way or another. In other words, it may just as well be false, and this type of deviance may've been a more fundamental trait of his. We just don't know.