Everywhere I have been in life, being indifferent seems to work well for all situations. Work situations, social situations, etc. In fact, the people who seem to survive (and thrive) the longest are those that dont seem to care. So if you know that anger, opinions and overall strong feelings hurt your trading, then why do you persist with these same attitudes? Why put so much feeling and angst into trades, when you know it will not help the situation?