It is arguable if more liquidity is a good or a bad thing from some sides, but I'm not sure how HFT increasing liquidity was ever a question? It is a matter of

It is arguable if more liquidity is a good or a bad thing from some sides, but I'm not sure how HFT increasing liquidity was ever a question? It is a matter of volume and there is more automated than non-automated volume in most equities and futures exchanges.