The problem with monarchy is that (among the Dissident Right crowd) it carries with it this assumption that a king will always represents the will of the people (or at least the best interests of a nation) better than any other form of government. But this is never backed up with any real evidence — there’s no historic pattern of monarchy being a superior form of government. People in the Dissident Right just want tradition, whatever that “tradition” may be, and regardless of how inferior it was, because monarchy is seen as a traditional form of government.

But the reality is that a monarch can do whatever he wants because he is a monarch. That includes supporting your racial replacement and siding with hostile foreigners.