Of course you can manipulate the market. You put up a huge fake wall just above the lowest ask. Real traders who want to sell will set their price below the wall. You move the wall down a little, the sellers match that movement and adjust their prices down a little to stay under the wall, rinse and repeat.
Nice proof that you're clueless.
Some people will behave according to your "algorithm". These are those kind of noobs which buy at all time high and sell at the bottom, just before the market turns round. And yes, the market needs a herd of clueless noobs. Those are there to allow skilful traders to make extra profit.
Some points you need to understand
- market equilibrium is driven by real forces, not fake power.
- people do buy / sell at a given point, because they want to do so, for whatever reason.
- when your strategy is built on cheating other people, be prepared to be gamed yourself.