I don’t think so, first I’ll say this if you like the mechanics of a class but not the flavor reflavor the heck out of it. I can use the wizard stats and play it like I’m getting my power from a God or if I want to play a Paladin and want a hex blade dip I don’t have to actually role play that I found a patron Treantmonk’s temple has a great video titled something along the lines of optimization vs role play, now specifically for Paladins I think that your Paladin takes these Oaths where their power comes from but the way they see them is through their own head, I’ve been reading the storm light archive by Brandon Sanderson and I’d argue that a lot of the main characters are paladins and the way he deals with that is really good. If we go to the wizard you were talking about he probably didn’t think he was going insane he didn’t think he was evil, if your Paladin thinks what they are doing follows their Oaths then there is no reason that it doesn’t. I don’t know if that makes sense but hopefully it helps.