A trader can trace his/her loses back to the trader's own incompetence. That is true, it will still be true if we where talking about basketball instead of trading, but to have a similar stage in basketball you'll have to allow any rookie that feels like learning the game to join the NBA and play with the pros [given that he pays the right price]... even more, he'll only be able to learn how to play basketball by playing at the NBA. Chances are that rookie is going to get his ass kicked "n" times before he either quits or becomes one great basketball player, and starts kicking ass himself. Same happens with traders... most people lose money to the market because they have to go against the pros from the start, is the only way to learn.