The typical LG paladin is the Oath of Devotion cavalier. Don't mistake the Ancient, Vengence, and Crown Oaths for the same thing. And, yes, the Avenger can even be LE (devils, after all, fight demons, and its very easy to call them the greater evil). That's a feature, not a bug.I feel like the tenets "Fight the greater evil" and "By any means necessary" give a lot of freedom for the paladin to do extremely heinous things that are completely unsuitable for a paladin.
There's a difference between Oathbreaker, and a fallen paladin that's not all fiendish. The Oathreaker is similar to being a Death Knight, basically. A fallen paladin just has abilities stripped away.Furthermore, even if they act completely evil, forcing them to be an "Oathbreaker" doesn't even make much sense since they aren't breaking their oath to do things like torture for the greater good... and it's hardly a punishment since it's Oathbreaker has so many benefits itself.
Sounds like a problem player being an issue, and not a class problem. Honestly, you're looking at a way to argue about your interpretations of the class. And that does NOT end well. Players are allowed to envision their characters their own way. If its an out of character problem, should be solved out of character. Taking OOC issues into IC is a bad move for a DM or player.In a game I ran recently, a paladin in the group went Oath of Vengeance and declared alcohol to be the greatest threat to humanity after seeing so many bar fights, abuses in families, etc, which all had alcohol in common. He went on a quest to abolish alcohol by any means necessary. During his adventures he would torture people or even use a Philter of Love to force someone to be obsessed with him for even the most vague information he could (like for information about a magic item that he rationalized MIGHT assist him in ridding the world of alcohol).
Frankly, torture is an icky situation in the first place, let alone very much not a solution to any problem. Let alone alcohol. I fail to see how the two are related, since it just drives drinking into hidden areas until the crazy torturer leaves. Let alone the laws he breaks and inviting punishment from mercs or authorities. If you absolutely insist on keeping it IC, then just put a bounty out or arrest him.
Some people seem to think that playing an evil character is a license to be all about dumb evil that does stuff because its funny to them. Its possible you're dealing with that.
This is only true for the Oath of Devotion, and maybe the Crown oath. The stereotypical warlock is fiendish, but we have goodly Fey and "Undying Light" as Patrons, for a good aligned warlock. Sorcerer includes Favored Souls, which is far and away NOT an arcane caster like the dragon bloodlines, but rather a divine caster. We have assassin-monks, we have swashbuckling and warlord rogues, we have bards that get away with no use of music. Don't mistake the umbrella class for their old archetypes - subclasses change everything.I have a view of Paladins as they are described as being the archetypal heroic knights in shining armor so this does NOT sit right with me but Oath of Vengeance seems to permit some ridiculous things without penalty.
Flat out tell him that its making the rest uncomfortable, and they want him to stop. If its a disruptive character, then leave him behind. That's all there is to it. If the group doesn't want him, then don't.I'm not quite sure as a DM how to reign that in while giving him freedom to have his character because it made the rest of the neutral/good party members extremely uncomfortable.