Fun fact; their building was used as a police station in The Dark Knight Returns.
There's a lot of really good work that comes out of CMU, including the department that helped the FBI.
EDIT: furthermore, SEI was doing independent research into the security of TOR. The FBI subpoena'd CMU to give up the results/contents of the research which is what ultimately helped the FBI do what they wanted.
This is a matter of legal debate about the intentions and methods of the government, IMO. To reiterate I don't think it's fair to blame students/faculty/researchers for not breaking the law and agreements that allowed them to conduct the research in the first place.
As for what CMU has done to insure that this does not happen again... I don't know.
https://duckduckgo.com/html/?q=CMU%20Tor
I linked to the HTML version for you, so it works without JS enabled. If you do this over Tor, that is the wise bet given your interest in reversing IP addresses through careless Tor usage pivotal to that investigation and others.