That's Scruton's institutionalist definition of "conservatism," which ends up being relativistic, as I argue. What's traditional is supposed to be automatically good for the population that upholds it.

I don't see why "progressive" should necessarily have that negative connotation. Technological progress, for instance, isn't so subjective.

Left-wingers can be tyrannical too. That's what happened in the French Revolution and the Soviet Union. But in those cases, ideology is the driving force of tyranny, not a cult of authoritarian personality. Conservatives are moved more by the master-slave dynamic than by ideas.