They need to settle their conflicts between themselves like adults. You don't have anything to do with it. You're not endorsing anything, just continuing to be friends.
It's hard to convey that you value them as people/users, without endorsing their opinions/actions on/against each other.
I like my friends and they aren't perfect. If you are outright about not endorsing either side, nobody should get paranoid about secretly picking a side. You should also have a rule about not wanting to talk about the conflict.
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