Would you say thay cars cause automobile accidents?
No they do not, just the drivers and manufacturers of those cars.

Same with computers and stock trading.

Computers are programmed by people and the computer is just another tool of the trade just as paper was.
What computers enable is split second trading and reactions to expected situations.

Ever wonder why some want to convince you to trade according to calculations based on stock history. In my opinion, To make you predictable. And with predictability of investors computers always win.

Just a few thoughts from the peanut, chips and beer gallery. Cheers.