People differ. Different people are also valid and can get things done, and may have unique strengths. Lincoln was classified as "melancholic." Pessimists may have more accurate views of many things. Do we really have to demand that everyone have the same personality as ourselves?
There's no sort of demand in the article. The advice there is to be a passive observer of human behavior rather than getting angry and engaging in flamewars.
Given the current climate I see on HN, this advice is spot on.
