does the idea of justice and morality align for emithas, or does emithas have a point where he will do anything for his loved ones?
I've said before he was raised with the ideal of doing no harm, by people new to physical existence, who became that way through coercion and refused to continue to take part in war.
To go from that into an existence in which most of what he did was harmful without a choice in the matter, well...it changed him. How could it not? How could he hold onto that ideal in such an environment?
Taking on the identity of the Varghest gave him some means of striking back: little, spiteful moments of inconvenience for the tyrants who'd uprooted his life and salted the bare earth.
And the rebellion? to borrow Tas' phrase, it was not civil. It was not bloodless. It was not gentle. They were up against primordial beings of immense, reality-shaping power (Rook's ability to stand against Elgar'nan was the result of a perfect storm scenario, any deviation from that would have meant their failure. I said what I said 🤷) far beyond any of them.
All that to say, ideals are great, but Emithas' lived reality made holding onto them a pipe dream.
does he have a point where he will do anything for his loved ones?
He reaches that point, or as far as he's ever gone, in one endgame scenario. He is desperate. He has tried to reason with Mythal. He has fought her. Neither convinced her. Now, in a highly fraught moment, he bargains, he keeps his word. He uses what's left of her as the anchor that maintains the veil, and it is not done (solely) in order to spare Solas that same fate.
In that moment, Emithas is vengeful.