I find it unlikely that they didn't live in groups, Eomer. The warg, after all, is a pack animal- highly sociable and intelligent. While the groups may not have been the huge collections that were once known in ME, I feel the groups would have been sizeable, perhaps about 12 adults.
I think it unlikely that wargs felt the War to be unimportant or not affecting them. The warg, after all, has the tremendous gift of foresight, and wargs are counted amongst the wise. However, the same could be said of Tom Bombadil or the eagles, I guess.
Perhaps it is fair to say that wargs were quite simply afraid of the consequences of the War, and thus decided to lie low. It may be slightly ignoble, but it seems reasonable.
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-- Well, I'm back.
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