I don't think any of the bashing the FBI gets is about suggesting they are breaking the law. Rather, the suggestions are that the law is limitlessly broad and a

I don't think any of the bashing the FBI gets is about suggesting they are breaking the law. Rather, the suggestions are that the law is limitlessly broad and allows nearly anything so it is nearly impossible for them to break the law in the first place (they can, for example, set up entire laboratories dedicated to fabricating evidence and send trained experts who lie on the stand as standard operating procedure with no repercussions). And given that their powers are so broad and immense, we rely on them acting in good faith and morally (we must, because we have nothing else), so we criticize them when they do not do that. Preying on mentally ill Muslims and concocting elaborate schemes which exploit their inability to function normally to trick them into "taking part" in (sometimes little more than just 'agreeing to') some sort of plot that doesn't exist and then patting themselves on the back for "getting a terrorist" and locking the mentally ill person in jail for decades is, well, sick, and not a shining example of 'acting morally', so the criticism is well-deserved.