It is. No democratically justified constitution can withstand such attacks if they are concerted; not without relying on an authority beyond the will of the people. The internal logic of democracy would be compromised. Said constitution would lose, by denying the authority of the people, its own; which is based on the former.
Because the rule of law is obviously not compatible with the rule of the mob only in a few examples does democracy not lead to ideological revolutionary governments. And because there is no organic solution to the conflict between law and popular will other than one of cultural tradition (though, looking at recent American political trends we can see how week even that is), one of these rules will endeavor to make itself absolute over the other.