Isn’t there a cognitive dissonance in making Eren care about this if he’s slaughtering 99% of the Eldian people with his Rumbling too ?

The AOTNR team had a good chance to make Armin hold on to this point in his confrontation with Eren instead of still moaning about good people living in the outside world too.

Like why should I care about Faye’s death, if she was just going to die trampled by the Colossal Titans in the Rumbling if she was still alive.