I'm not going to make any comments about Mel Gibson over his choice to do this movie as I don't know enough about it.
I will, however, comment on my experiences with BATFE.
I was in the firearms business in the 1980's and one day I had a visit from 4 ATF agents. They came into the shop and after identifying themselves, they began to accuse me, or one of my employees of an illegal firearm straw sale to a convicted felon. The ATF agents produced no evidence to support these accusations except to say that they had "an informant" who witnessed the sale. (Note: The ATF agents never knew about any sale, illegal or not. They only knew that a convicted felon had been arested on an unrelated charge and was found in possesion of a revolver that had been purchased at one time from my shop).
To make a long story short, there was no illegal straw sale, ATF had no evidence of any such sale, and their "informant" was a convicted felon himself with a long history of drug problems. This informant is the same individual that ATF used a few months earlier in an attempt to entrap another, private dealer in the area on a supposed attempt to sell a class III weapon without proper paperwork. ATF's case was blown up in court by the dealer's attorney but not until after the dealer had spent $50k on his defense. I know that dealer personally, and he was very cautious about how he ran his business and to whom he would sell firearms. When the convicted felon informant had approached the dealer at the behest of ATF, the dealer informed him of the law, told him that he wasn't about to jeopardize his license over any illegal sale, and then told the guy to get out of his shop. At the close of the case the ATF agents involved looked at the dealer and laughed at him as they left the courtroom. Your tax dollars at work....
After I spoke with the other dealer about his case with ATF, I received a call from Larry Pratt with Gun Owners Of America. Larry gave me all the details of ATF's entrapment case involving the use of the same felon informant that they had threatened me with, and offered to help should ATF pursue a case with me. When I confronted ATF with this information, including my knowledge of their use of this convicted felon informant, they began to back off. But before leaving for good, ATF went through my 4473 forms and said they were going to take a number of them back to their office with them. I told them I wanted a signed, itemized receipt of each form they took. That reduced the number by half, but they still took them. They told me that they would have the forms back in a week.
Now here's the final twist to the story, and the reason why I still have respect for professional law enforcement, but NOT ATF.
After a month had passed and I had still not received my confiscated yellow forms back, an FBI agent came into the shop. He identified himself and asked if I could possibly help him with a case he was working on. There was a convicted felon (a different one) who the FBI believed had purchased a firearm illegally and they were trying to find proof of this. The agent said that he could subpoena the 4473 forms, but that he would prefer to ask for cooperation first and avoid that. I told him that I would be happy to help and we proceeded to go through the 4473's. While doing this we struck up a conversation and I told the agent of my encounter with ATF and about the confiscation of the yellow forms that had yet to be returned. The FBI agent got a look of disgust, embarassment, and anger on his face when he learned of ATF's behavior. He told me that he'd check up on this for me, and four days later I received the forms from ATF registered mail. Another law enforcement friend of mine later told me what the FBI agent couldn't say to me directly; that he was mortified by the complete lack of professionalism that ATF displayed, and how embarrassing it was that they should be considered Federal Agents.
I remain to this day, a supporter of professional law enforcement, but completely loathsome of ATF and the affront they are to all Americans.
(Believe me, this is the condensed version of what was a long and sorted story of ATF abuse)