Kraco, my gripe isn't to do with Eren's mental fortitude or how he weighs collateral damage. It's whether or not he even knows about collateral damage in the first place.

In this episode, Eren fought Annie. Annie left for an open battlefield to avoid losses. It's not as if Eren didn't give a shit about losses, but it's that he didn't even know about them in the first place.

He's not saying "I'll kill titans no matter what" or "these losses are justified by discovering her secret". He's parading with his killing mentality while being oblivious to the lives he directly or indirectly took. DE brought up the question about which of these being the worst. For me, it's definitely Eren holding his head high with his ideals thinking he avenged humanity and his family without knowing how they've suffered from his actions at the same time.

Disregarding whether Annie and Erwin made the right choices, they're at least responsible for them. Eren's lack of awareness doesn't allow him to take responsibility for his based on this episode - and that is my problem with him.