I was interpreting wingding's statement as describing how coins issued prior to the fork would still be spendable on the inflatacoin side of the fork ... that they wouldn't be touched (i.e., "harmed").    But my assertion is that any spending of a "pure" coin issued pre-fork is a valid transaction on both sides thus any spending on the inflatacoin side is harmful to the holder of the coin.

A pure coin is one that has no taint from the coins issues after the fork, and thus would be a valid spend transaction on the Bitcoin blockchain side as well.

Now I suppose you could ensure that the inflatacoin client included in every spend transaction some taint in the INPUTs so that the transactions would only be valid on the inflatacoin side.  I still personally wouldn't use any coins with that client until they've been fully spent on the Bitcoin blockchain side, but after that I might milk the inflatacoin fork for whatever I could get from it, sure.