What's professionalism? A job done without emotions, or having the emotions restricted? In the end it wouldn't much differ from working with robots. Or are the emotions a threat because authority figure's emotions can be a sign of a weakness, or do we subconsciously fancy emotionless and calculative psychopaths, for us to let go of the control to somebody else?
There in the very thread he does all he can to help solve the issue and learn more about it. A challenge: find out the Linus expletive and outburst frequency per year.