Fitzgerald's character made no sense
At the beginning, he was established as an alpha male bully who's racist and keeps shouting 'THE PELTS!' Then after the Indian attack, you kind of feel for him, how THEM PELTS really are all he has going for him, and you might even understand where his racism is coming from if you're not a SJW libtard. The Indians well, were savages during all his encounters with them. They were some serious killing machines, even zombie-like, I don't blame him for feeling a little fearful.
And then his wanting to quietly put poor Glass to sleep and move on really was the smart thing to do.
It doesn't seem realistic at ALL that these men would want to coddle glass, at that point he was a literal corpse. And they just had 30 of their men SLAUGHTERED..
Fitz was the only one in the crew with balls. Killing glass would have been the right and moral thing to do. Glass even blinked, telling him to do it, and it didn't look like he would have without glass's consent.
But then all his good traits go out the window when he tries to choke him slowly, kill his son, and then he tries to bury glass alive? Wtf?! And then suddenly he says 'well you do it' to the other kid, when he was the one who wanted to kill him in the first place?
It's like Fitzgerald went from somewhat normal to a cold blooded psychopath with the drop of a hat and showed no signs of being crazy before he snapped.