Well it's not evil but you can refuse to help the herbalist's shop's clerk. It's nice to have the option to be able to do "evil" things to babes, but ultimately it's up to the player. And I bet 99% of players will be nice towards babes and not necessarily towards the others. You would have to make a babe really evil, especially towards the MC, for the players to want to kill her.
No, refusing to murder for the shop-keeper is not remotly evil, and the MC even frames it as a service to the shop-keeper rather than telling the shop keeper to go fuck herself for asking the MC to be an accomplice to murder.
As for the rest of your reasoning, that’s basically why we got so many spineless simp MCs that can do nothing but simp, simp and simp yet again. ”We got to be nice to the ladies”. Urgh.
There are so many solutions to this:
1. The MC do not need to fuck every woman he/she comes across. This might sound like a novel idea in this context, but most male characters that the MC doesn’t fuck (but might murder, beat up or otherwise treat like shit) could be switched for female characters the MC doesn’t fuck. In this version of the game, there is a total of four male characters that the player is given the choice of killing (one mercy kill, three murders). Every single one could just as well have been female. So, for instance, the inquisitors son could have been a daughter and the shopkeepers husband could have been a wife, or, if lesbianism is not accepted in this fantasy world, an overbearing mother or step-mother (would have worked age wise too). An easy way to create a bit more variety and to not be so predictable and silly. And I don't mean that it should have been done in this version of the game, it is fine that it is only dudes this far. But if it keeps up and the bodies that keep pililing up are all men, it becomes silly and trope:y
2. But even having fucked a woman does not preclude the MC from treating her like shit or killing her at a later date. Either simply because the MC is an uncaring and amoral fuck him-/herself (like the MC in this game is described as being) who simply do not feel any loyalty towards women he/she fucked just because he/she fucked them, or because the woman betrayed the MC (or did some other similar bad thing) in the first place and gave the MC a reason for taking revenge.
3. Fucking does also not have to be gated behind being nice and deferential. In fact, sometimes, being an abrasive and selfish asshole can work to the advantage of the person who wants to fuck a certain woman, because some women are attracted by that. Or, if you want to take it even further, the MC can go for the non-consent route and get the sex even if the women in question hate him/her. Now that will not be happening in this game, as it has been confirmed that the Dev will not include anything like that. But it is absolutely a way to do it, *WHEN* the MC is supposed to be an evil/amoral fuck.
To give three examples, I am sure there are more.
Finally, I do agree that it is best when being evil is a choice for the player, rather than automatically given. But it goes both ways, I also prefer to be able to choose be a do-good:er rather than having the role forced upon me by the dev.