Interestingly, this stuff from Marx particularly is probably the most 'right-wing' thing I've ever seen on our war with Mexico from a noted historical figure. More than Emerson and certainly Lincoln or U.S. Grant. And this from a radical left intellectual. It comes off almost Nietzschean-heroic and Sorelian-fascist in its glorification of violence. Sorel, a leftist himself being an influence on fascism indicates how little the labels 'left' and 'right' can mean. When we've reached the point where Karl Marx of all people could plausibly be appropriated as an alt-right thinker it's some kind of watershed I think.