Trading with a plan is necessary - obviously (or at least it should be obvious) you can't just enter the market and hope you luck out, you have to have contingency plans, but on the other hand a trader should be adaptable, i.e. should be ready to change the plan if they see it's not working. Blindly following plans can also cause trouble.
As for the person trading coffee described in the first post - that guy was very unethical, dishonest and irresponsible.
As for the person trading coffee described in the first post - that guy was very unethical, dishonest and irresponsible.