Be explicit that you would rather not pick a side. If they really like you, they won't make you a casualty in their own conflict.
So you risk taking the double-negative (you're seen by each as endorsing the perceived evil of their foe, by not siding with them)?
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.
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