"Partisan" is an interesting word. Per the dictionary, as an adjective it means, " feeling, showing, or deriving from strong and sometimes blind adherence to a particular party, faction, cause, or person." If my cause is balance in all things, a common element of neutrality in D&D terms, is that not also a partisan position? The opposite of balance is imbalance, which might be quite a dangerous path to follow.
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I get that you are trying to spark a philosophical debate, but these are questions of semantics, and semantics just aren’t all that interesting.
So long as it is practical. Evil only works for me so long as it makes sense. Kill someone for fun? Nope. Kill someone because they have an artefact I want?
Yes, I can do evil, if there is some purpose or justification behind it. I was never able to do Bioware evil, as I found it too unenjoyable - being a cruel and murderous person for... lols? Why would I consider being evil, and if being nice leads to more satisfying places without losing anything?
Indeed, too often 'evil' playthroughs devolve into murderous psychopaths that kill everything and anything, without any nuance or degrees. Most evil people don't think themselves evil (mortals that is).
Doing a play through of a character who is evil but thinks himself a hero might be fun. I’ve never had a game give me those sorts of options explicitly without lots of the heavy lifting being done in my imagination.