The stuff that Herzog always makes movies and documentaries about: human folly, overreaching ambition, hubris, deliberate blindspots, self-deception, ignoring reality. Sometimes accidental nobility, but mostly not.
As most here would agree, those characteristics define Treadwell's self-appointed "mission on earth". He repeatedly says "I am protecting the bears, and no one else is." But he's not, really. He's exploiting them (and the wilderness) for his own psychic benefit. Hubris, self-deception, and folly run thick in Treadwell's veins. (IIRC, Herzog even mentions the possibility of flat-out narcissism.)
So don't go after Herzog because he's made yet another film about a strange person with strange ideas. That's what he always does.
But if I detect so much as a whiff of "All Actions Are Justifiable So Long As One Acts 'Passionately'" or "The Only Truth Is That There Is None", I'm gonna be all over it.