Einstein's views on the politics of his time were mistaken in many respects, as were the views of so many other intellectuals of the early decades of the 20th century. These intellectuals were seduced by their egalitarian sentiments to embrace communist principles, but they either failed to see, or turned a blind eye, to the monstrous abuses carried out by the men who implemented the communist ideals in the Soviet Union and Red China and elsewhere.
I agree with you that deep insight and high achievement in one area does not translate into the same in other areas. Clearly, Einstein was a much better scientist than he was a political observer.