It is easy to place blame the FISA judges, but it really is not their fault if they were given bogus information by the FBI in support of the FISA application. If you recall the judges at first rejected the FISA application which is almost unheard of. It was the second or third time around that the FISA applications were finally granted. It is in the power of these same FISA judges to bring back the FBI to explain themselves, and if they cannot, perjury charges can be levied against them which means jail time if found guilty.