Mate you dont really have a clue about trading, especially if you think there is plenty of volume out there. There is nothing wrong or manipulative about selling 10% of the daily volume in 2 seconds.
That's just entering a big short position and putting your balls on the line. How does it guarantee profits? If the market is strong, then what? This algo will get his stock soaked up and pushed offside with no one large enough to get out on, he'll be massacred. Even if he manages to get the price down, he still need to get sufficient sell orders down there to cover.
There are so many instances of market manipulation by these HFT's and you focus on this??? Isn't helping the cause against the real scum one little bit