Because if you guilt-trip the population into believing, their misfortune is due to majority vote, being in favor of controversial policy (which is bipartisan); they will fight amongst each other, as opposed to their monarch. But with today’s surveillance technology, a monarch would be able to avoid mass protest: by impairing leaders during the early stages of their movements; prohibiting these from snowballing out of control. This would further simplify the process of control, as opposed to having to ensure corruption, in the binary left-right politics.