these panty-waist prosecutors keep it up, we're all going to die.
It's not the prosecutors, it's the FBI. The local prosecutors want to charge them, but the big-shot feds come in and say "no evidence here" and get the guys released. From the article:
In the Michigan case, the FBI said Monday that it had no indication that the men had any ties to know terrorist groups. Local prosecutors, however, were standing by the charges.