You can't be that ignorant !...or I just think that you are utterly disappointed about MC not being a complete sociopath or whatever character traits you expected him to have ( I read your previous posts mate ).
If it makes you feel any better, I'd say, MC is still not all in the light like you all described him to be, he is still a darker person if you ask me. You can't just stop being yourself or whatever you've become because of, let's say, a certain traumatic experience, just like that. Take a look at this...
His head is still up the dark clouds...just because all of his interactions not include a gun doesn't necessarily make him a not darker person.
Amber is mostly professional and genuinely guides MC to the end of the tunnel. Like the Lady said, we don't have much enough content of her to decide whether she has ulterior motives towards MC or not. You can replay the therapy sessions one more time and decide again for yourself mate.
See, she genuinely wants MC to grow out of his prevailing condition regardless of her "ulterior motives", if she has one of course but I'm sure there is none.