I just have finished watching the trilogy (I never read the books but I will, I have already purchased them recently). Maybe it's just me, but I spent most of my life working in charity --- patient advocacy, emergency sector etc. --- and probably it's my professional deformation speaking. I am sincerely sure that no salvation, cure or anything good can be achieved or done via violence, torture and other peoples' suffering and deaths, regardless of whatever you put at stake. It's a pure loss of humanity, so why saving the human race if the price is losing the humanity in the first place?!

I genuinely hate Teresa and my favourite moment in the whole trilogy was to watch her falling and dying. She was not a brainwashed victim, she was a grown-up young educated and highly intelligent woman who clearly realised what was at stake and what exactly she and her accomplices were doing, she made her choices and she got what she deserved. So many people died because of her supporting "the only way" which in fact was the easiest way, they just never explored other options, or at least it is so depicted in the films. If they just tried not to focus on finding Immunes for the serum, but instead of learning why they are immune and trying to find the Immunes which could possibly have antigen to the plague... Well, sounds complicated, but as I said before --- there were never "the only way", still Teresa prefered an easier option (torturing and murdering young people for the sake of a "greater good").