The artilce makes perfectly clear that Hastert and the leadership were concerned enough about the emails that they investigated further but *didnt find anything*.
According to everything I've seen, they didn't find anything because they didn't look. They asked Foley, he denied anything wrong, and they accepted that. I'll repeat from my first post: "Any administrator worth his salt would worry that there was more, and would check with current and past pages to see if there was a pattern of problem behavior. " If that was done, we've not heard about it. I'd be happy to hear that there was that sort of investigation.
They aren't "administrators". This isn't an office. These are the elected leaders of men and women elected to office by their constituents. They couldn't go further because the boy's parents said they wanted his privacy protected and would not allow further investigation. Thye just wanted the leaders to do what they could to persuade Foley to break off communications with their son. They did that. He promised he would have no further contact with him or any other interns or pages .