Ultimately it's analogous to the law of gravity. Without the 'bouyancy' afforded by divine breath, we sink into the waters and drown.
On a more precise psychological and ideological plane, it can only be because ‘conservatives’ have tacitly accepted the principle at the heart of revolution, namely egalitarianism. Thus they have no principled reason to oppose the left, only pragmatic and often basely economic arguments about avoiding ‘too much of a good thing’ or ‘too much, too fast’. Those to the left are viewed as good-hearted if perhaps a bit rash. On the other hand, such ‘conservatives’ do have a principled reason to oppose people to their right, whether or not those people really believe in hierarchy or not: since they stand further from the central principle of universal equality, they are therefore bad people.