I have seen this at least 10 times because it used to be on C4, late, a lot. Val Kilmer is struggling because he's in denial of his mixed Native American heritage, as an FBI agent assigned to use duress on these same people - I would've thought these FBI were based on Mark Fuhrman had this not pre-dated those events. This makes it all the more special when he unleashes all sorts of empathy and rage on their behalf.
Unfortunately Michael Apted isn't an author and Thunderheart, as most of the films he directed , falls short soon. The theme handled is interesting though, the actors professional enough, the landscape even beautiful but there is nothing you can do about it, the film misses something essential: a spark of ingeniousness. I should have seen a giallo instead.