I do hope that, somewhere along the line, he eventually gets some sort of redemption arc. I love the game, I love the girls' stories but I kinda don't like playing as a piece of shit. I believe that among all his mental instability there is still some good and eventually you can fix your mistakes or something like that.
I think, ultimately, in the very long run, this will happen.
It is not that Newsei, the new Sensei (or very Oldsei, so to speak, unbeknowing to him) is an unempathic asshole.
The issue he has right now is that he does not feel that he belongs in this world, that it is his world, his story, his history.
And therefore he does what probably many in a very unique situation as his would do: treat it like pervert GTA.
We humans, aside of my firm belief that we do have morals for other than mere selfish reasons, act (mostly) responsible and considerate because of the consequences our actions would have otherwise. But if we think there are no consequences, that nothing is real and nothing will have lasting damage, then I am afraid most of us would succumb to our darker, more free and much, much less considerate fantasies that deep down we all have ("I wish I was more of an asshole but...").
Newsei is in this state of mind. He still treats it as some kind of game (ironic, isn't it?), as something without lasting consequences, so why would, should he care? It also is fundamentally a very interesting situation, as he is a New Sensei "reborn", yet hinted to be the very first Oldsei nonetheless. So he is in a very direct conflict with everything his actual self stands for, without even realizing it.
This realization will come though. And it will come through quite great tragedy during the sad arc. And we can at least make an educated guess that he will be able to fix some of the damage his previous, all to (in)human error caused.
The big question though, and the whole full circle of this game is if he can still save Maya, and if there even is a chance for that. That is the question I think no one aside Sel can answer as of now. (Though ffs I really hope so. She deserves so much after all the pain she already has endured during all those cycles...)