Though Solomon Simon was viewed as on the ‘right’ for his generation, the ‘right’ among American Jews in the late 30s was mostly made up of socialists by temperament who were unaffiliated with any revolutionary party, of Social Democrats, and, at what would be seen as the real ‘right wing’, of progressive Democrats who believed that Roosevelt would get most of the results that the left had been pressing for. Another post makes it clear that he grew at least somewhat more politically conservative over time. But there is no reason to suspect that his sympathies for working people fundamentally changed.
He also knew his audience. Writing for the children in the Yiddish schools meant writing not only for his own group, the Sholem Aleichem Folk Schools, but also for the parents and children of the Workmen’s Circle schools, who were more frankly socialist, and for the parents and children of the Farband (labor Zionist) schools, and the Communist schools run by “the Ordn”.