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More often than not, I've seen the kind of self-righteous behaviour you describe: the Paladin player believes they are entitled to dictate the actions of the rest of the group, which they may not necessarily be comfortable with. Or, to put in your words: the Paladin shits all over the social order of the world, and expects others to take his crap. Such a scenario is detrimental for all involved.
I would be very interested in that. The point beeing is, that with playing a paladin I normally do not mean playing a paladin from a totally different plane or something like that.
And I do not only mean it in the DnD context of paladin.
Paladin is a Warrior, who is an acknowledged fighter for the true good in the region you are playing in.
Normally, it is quite hard to have somebody in the group to top that in the matter of rank. (Historically paladins were one step under the emperor/King)
Of course their social power goes byebye, moving to another plane, country or whatsoever.
Still, everybody coming from the region his rank is to consider should show appropriat behavior.
So the question is: Are you talking about groups with totally different cultural background and moral values (which played out correctly leads to PvP quite soon, if the differences are big enough). Thats a fact with or without paladin.
I mean going around that way, you can have grey on grey violance equally fast.
Or are you speaking about integrating a character not fitting into the group?
Both points have actually nothing to do with the paladin itself.
I mean you do not a generic "paladin" in Shadowrun to be a problem in a group involved in "slave trade".
To use TJ definition a "paladin" with their "social values" on the other hand would not pose a problem at all.