I think that the article is using caricatured descriptions of two categories that are more broad (people who are oriented toward change and those who are oriented toward stability) and highlighting only the good of the preferred group (his own) and the bad within the "other". The truth is, there are beneficial and destructive individuals in both groups, and there are perspectives from each that we need. I would argue that what society really needs is not the ascendancy of one group above the other but mutual respect and discussion of ideas between groups.
Which is kind of where he was going with the discussion of ideas. He just didn't have a big enough tent.