If a professional pilot is declaring an emergency because he or she was too afraid to carry above minimum fuel they need to have a long hard chat with themselves, and if it happens more than once they should be stripped of their rank when they get back on the ground. In all airlines there are fuel misers and I'm sure we have all listened to obnoxious desk pilots who never fly about how reliable the minimum fuel figures are 99% of the time... my response? That's cool but I remember how it feels the 1% of the time it doesn't work out.