I think the FBI was open minded.
Until the BHR meeting with the Senate staffers. The staffers, juiced up on the NYTimes pieces and other innuendo pressured the FBI or Justice Department to go after Hatfill. The Justice dept. gave the staffers and the MSM what they wanted, Project Hatfill.
I take care in saying the "FBI." There's other forces. A pic tells a thousand words and I remember the Ashcroft news conference which was a virtual reality perp walk. Behind him were his assistant, smiling, confident with their success. I thought maybe three is something to this Hatfill stuff. Turns out there wasn't.
They were probably duped by the burgeoning MSM/NYTimes full court press on Hatfill.
Whenever somebody accuses someone else of something really serious (like being a mass murderer for example) on the basis of little or no hard evidence, extreme skepticism is always warranted, because what's usually going on is that the person has a strong personal vendetta against the "perp" being fingered. Steven Hatfill is the type of person who pretty much embodies everything that someone like Barbara Hatch Rosenberg despises.
It's even more sad when you consider that the upper levels of the FBI are usually so skeptical that they'll often ignore the advice of their own field agents. They're going to come to regret the day that they listened to that kook.