Update: In examining the Paris decision, David Roberts at Vox re-visits his tribalist/cosmopolitan dichotomy explanation for Trump, and at the end of this section, the "masculinity must dominate again" aspect gets a mention:
Clearly, you can see how this is so true, when you read the many examples at Catallaxy.
Trump is a tribalistThe hallmark of tribalism (a term I prefer to “nationalism,” as it gets at the deeper roots) is that it views the world in zero-sum terms — if one tribe benefits, it is at another tribe’s expense. As has been much remarked (see my post on Trump’s mindset), this describes Trump to a tee. He views all interactions, both personal and international, in terms of dominance and submission.Tribalism has also entirely subsumed the US conservative movement. The intellectual core has all but rotted; what remains are older, rural and suburban white men and their wives, angry that their tribe is being demoted from its hegemonic position. At a barely beneath-the-surface level, Trumpism is about restoring old hierarchies: the powerful over the powerless, whites over minorities, men over women.