As Scataphagos said, stops are crucial, and placement is an art. Whether hard stop or mental stop may be a debatable topic, the crucial and art characteristics still apply.
The psycho of the stop....
"I'm risking ______ on a play. If the market goes against my play by (stop amount), I must conclude that my play "might be/or is" totally wrong. At the stop point, it's "wrong for a little". If the trader lets the loss get much below the stop point, he may end up being "wrong for a LOT". That's a risk a trader need not nor should not take.
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