The thing about Dredd is that it constantly asks the question of wether a society like this is worth saving. The citizens of Mega-City One live dull, horrible, gray lives of crushing alienation punctuated by explosive spurts of absolute insanity and ending with their bodies getting literally thrown into a conveyor belt with hundreds of others to be recycled into products. Is that a life even worth living? Not to mention that for all their bluster of being humanity's last hope for survival, the judges have failed repeatedly at even that basic level. And you can also take into account all the different options we see within the strip, like space colonies, farm camps, even the Cursed Earth looks downright hospitable compared to MC-1 some times.
Dredd is a very flexible strip, yes, but it should never be mistaken as one that advocates for a police state. Even Twilight's Last Gleaming was more of an in-universe solution, intentionally smudged by the unique conditions of MC-1's electorate.