I don't know if you have been on the other side of what market makers do, but its not exactly a day at the beach. Once you gain enough insight to see whats going on the charts you just see it as a graveyard of traders positions, stop losses and their capital. This happens every minute the market is open at every timeframe.

Have you ever wonder why the markets appear so irrational? Great economic data and the worse drop in months or vice versa. These are the expectations, emotions and psychology of the masses that are liquidated by market makers. Have you also just had a gut instinct to buy or sell and market moves completely opposite beyond your psychological limit. Only for it to start moving into profit once you have closed at a huge loss. This is all market makers do all day.

In principle there is nothing immoral here. Participants are all taking risks voluntarily, no one is forcing you risk trading the stock market. But in practice market makers take positions at the stop losses 90% of market participants giving them significantly overwhelming supply of assets at the best prices, while everyone else sees consistent intractable losses.

This is a Darwinian environment where only the biggest, fiercest and most aggressive players will win by killing weaker, smaller and less knowledgeable players. The only way for a small fish to win is to understand the rules the market makers play by. Their strengths, desires, weaknesses, limitations and once you do you realize that this was someone's capital, but it's also capital not going to the market makers.

Instead of reaching for this horribly irritating snark (I'm sure GP understands market making enough to understand why HFT exists), why not be charitable and consider the opportunity cost of the smartest people spending their mental energy to create a slightly more efficient market? Is this really a responsible use of this resource?