Peterson may not be a specialist in that field, but he adopts the standpoint of evolutionary psychology and tries to combine it with Jungian psychology. Indeed, his explanations seem value-laden and slanted towards providing men's-help therapy.

I suppose my concern here isn't with evolutionary psychology in general, but with his use of it. I think I was careful to say in the article, though, that evolutionary psychology is "liable" to be misused with just-so stories, not that it's always misused.

The ideals of existential psychology and of social Darwinism seem to be in conflict, as I say in the article. In so far as evolutionary psychology doesn't entail social Darwinism, I think the former would be consistent with existentialism only with respect to the explanations of how aspects of our existential condition are adaptations. That is, the values would come from existentialism, not from evolutionary psychology.