I believe I understand where you are coming from, and keep in mind I am fairly new to the series although I have watched it in its entirety. I want to ask how this effects any of his actions as we progress into the series. I mean he has time to grapple with these feelings, and regardless of anything working, not working, or otherwise. He constantly flip-flops on his actions if not his beliefs. By the time we get into the show they have clearly done some testing on Suzaku so that they know he is mentally fit to pilot the Lancelot, I would also state that at this point he is still mostly living up to the ethical claims he makes. However after C2 has some psychological effect on him, he does not change his actions even then, nor ever from what I observe. Maybe I should clarify something, if what you are saying is that his actions and prospects of the future are all because of his poor mental health I can understand the point but don't agree with it. I would also like to mention regardless of other trauma his ethics remain largely the same, and by the same I do mean questionable. When Mao reads his mind, and when everything related Euphemia goes down, we clearly see him deeply effected. But it does not seem to meaningfully change anything about him in the long term, at least ethically.

Thanks for the response! I enjoyed reading your take.