Paterno did NOT do the right thing - either legally or ethically.
If he had, the person in question would be in jail getting a taste of his own medicine and Paterno's legacy would be about football and an honorable retirement - not child molestation and cover-ups.
Why focus on just Joe Pa? Why aren't you attacking the 28/yo GA who SAW the act and didn't do anything to stop it? How about his father who he told THAT night, but didn't call the PD and waited till the next day to contact Joe Pa? How about the janitor who witnessed a similar event in 1998 but didn't report it or call the PD. What about his janitor buddies who he told about the event in 1998 but didn't report it or call the PD.
Legally, Joe Pa did exactly what the state requires of someone in his position. IF his superiors would have done what the state requires of them, they wouldn't be charged and the perp. would have been put away a long time ago.