Basically true, David Horn. Extremists are against law and order when not in power because they seek to destabilize a political order that they do not control but seek to control. Once in power, the extremists insist upon the most rigid control of society -- one that crushes all dissent or rivalry against them. They are anarchists seeking destruction of such order as exists and then they seek to control everything.
The ideal subject of totalitarian rule is not the convinced Nazi or the dedicated Communist but instead the people for whom the distinction between fact and fiction, true and false, no longer exists -- Hannah Arendt.