No, the FBI shoulda ID’d and investigated him from the tips (after all the FBI has apparently volunteered as America’s Premier Investigative agency to find and fix people presenting a domestic threat).
I don’t think the FBI is the proper authority to separate this guy from society, but they volunteered. And failed.
The FBI are responsible for running a sort of “Watch List” to keep some people from buying guns. Watch Lists seem to be generally failures in preventing violence. This is just another example.
“but they volunteered. And failed.”
I don’t know if “volunteered” is exactly the way it works, but failed they certainly have.
Actually, the word “failed” may be too mild. Maybe, “joined the forces of evil...”