Dredd is the legitimate authority figure, and beats the shit out of costumed vigilantes. One constant theme in the strip is what constitutes his legitimate authority, and whether or not he is a protector or an oppressor: the writers seem to come down pretty firmly on the side of oppressor: Dredd is supposed to be a fascist bastard and the system he represents is a regime which, despite it’s well-intentioned beginnings of restoring order and safety in an era of anarchy, has become a tyranny which exists only to perpetuate itself.
There are numerous storylines in which any attempts at reconstituting a representative democacy are brutally - and often illegally; Dredd’s system is adept at flouting its own laws “for the greater good” - suppressed. The graphic novel America is an excellent example, mourming for a lost America of individual freedoms: it opens with an image of the giant Statue Of Justice towering over the Statue Of Liberty.
I would further like to point out that “liberality” does not mean the same thing as “liberalism”, or indeed “liberty”: it’s synonymous with a bountiful excess, which is presumably not what the writers had in mind.