The Washington Post on Hastert when the Foley business was first brought to leadership:

Under indictment and out of the leadership, DeLay was fighting for his political career when Rep. Rodney Alexander (R-La.) brought Foley’s suspicious e-mails to the leadership in November 2005. That same month, Cunningham pleaded guilty to accepting $2.4 million in bribes.
With DeLay gone and Rep. Roy Blunt (Mo.) serving as both majority whip and majority leader, the House leadership simply lacked the bodies to forcefully take on the Foley issue, the former aides said. The page program was the speaker’s domain, but the speaker, already disposed toward delegating responsibility, was getting tired of all the scandals.
“The speaker has been preoccupied and distracted for more than a year,” one former leadership aide said.
“Frankly,” said the second, “he was tired.”
Hastert spokesman Ron Bonjean disputed that assertion.