One of his examples is quite amusing, if you've been following Feser's blog recently:
In light of these facts, opponents of capital punishment, war, and the like are bound to be tempted to conclude that enormous numbers of their fellow citizens are simply depraved. (It does not occur to them that what is in fact going on is that widespread continued support for the death penalty and for just war reflects a residual grasp of the demands of the natural law.) Frustrated by the persistence and popularity of attitudes they regard as immoral, those of what I am calling a “militant pacifist” mindset are bound to become even angrier at these perceived injustices – with a spiral into wrath and its daughters being the sequel.
Indeed, many people who pose as purveyors of peace and love give the consistent impression that they are Angry and Enjoying It!