High speed trading in itself doesn't do any harm to individual investors, quite the contrary - spreads are much tighter, liquidity is there. I see it as not rea

High speed trading in itself doesn't do any harm to individual investors, quite the contrary - spreads are much tighter, liquidity is there. I see it as not really harmful, but also not socially useful at all. One could argue that the real harm it does, is that since trading is cheaper, it encourages gambling.