This is great common sense thinking. We have all the different emotions for a reason. You can even think of them as the tools. Right tool for the right job as programmers love to say. If someone follows article's "scientific" advice and stays angry all the time it will just become really stressful for him. I think if you are really dissatisfied with something it's best to burst out in anger and forget about it after few minutes. At least that's how I use this anger tool :)