I think what you are proposing sounds similar to what I said at the end of my first comment.

Example: most people I've talked to about Goblin Slayer peg his alignment as Lawful Good, but I'm fairly certain if you decided to do ethnic cleansing in your game the other players might take issue with that.

I think the strongest counterargument would be something similar to playing as a sort of Monster Rights activist in a more traditional sword & sorcery setting, trying to get kobolds and goblins standing in civilized society so people cant just kill them for fun. You'd be facing a lot of opposition from the world, and your goals likely run perpendicular to those of the other players, but that seems like the same kind of fun as what I am doing in my campaign. However, based on my argument earlier, this would be a Lawful Evil character lmao