The Punisher for PS2 already did it, although they have the excuse of not having needless violence would be nerfing the character, who's mostly about fighting the underworld as violently as possible. Not sure how they can say the same about Fischer.
For all that matters, a "moral choice" should have some implications in the game. For instance, want to torture them for possibly false intel that can lead the player into an easier way, or into a trap? Sure go ahead. But don't be surprised if after a couple, the CO decides to cut off starting mission bonuses or simply recall the whole mission considering the player to be rogue.
There's no "moral choice" if all that happens is an achievement for killing x or sparing x enemies.
Okay, let me think...
This kind of brutal interrogation could be solved better.
When Fisher need someone to interrogate to receive important information from the person who has it but doesn't want us to tell them at the beginning so we keep the victim and ask him a series of questions with multiple conversation options if the conversation is not successful, we have only one option, which is characterized by the brutal treatment punching the victim in the shoulder knife or something else. It's your choice how you gonna approach from this interrogation; should be able to interrogate, and if we're lucky, interrogate the victim without the use of unnecessary force, right? The entire system of interrogation that would be to make the election and not on the fact that Fisher uses violence without mercy as it can be done in a more subtle way.
Let me give an example of one. When Fisher caught the victim in a dark room and try to use persuasion if you opt for the wrong choice of words, and after a while we can't sacrifice enough to scare revealed to us all that if we have to choose from such as dislocation / fracture shooting arm, leg to show the victim that we no joke and if we use the wrong words again and our victim is still based then crushes his arm, leg to the pain became unbearable leading to the fact that in the end will tell us everything.
This is more appropriate and believable interrogation than actual from Blaclklist.