Collective punishment can only be forward-looking, in the sense that the only purpose it can ever serve is deterrence. (Whether this is effective is a different question; under the right conditions I have a great deal of evidence that it can be extremely effective. These are far from the right conditions.) Its purpose clearly isn't strictly retribution, because of course collective punishment inevitably sweeps up people who may or may not have been involved in the conduct at issue. It's purpose may be the provision of recompense to some other group harmed by the group being punished, which I suppose is backward-looking in that it seeks to right a specific wrong, but naturally that correction is intended to provide a more just future. I think collective punishment can be an extremely salutary force for good and peace and equitable distribution, as well as the moral well-being of all its subjects.
Slapping people in cages without telling them why is one of the less effective ways to institute it, but - no one asked me.
I also entirely disagree with any assertion that squads as implemented here serve to amplify a diversity of voices. (I also entirely disagree with any assertion that there is some justification for allowing any voice to be amplified at all except that which is right, but I seem to have slipped so far into this place's muck of representative democracy that every single conversation I have is now tacitly preceded with but for the sake of argument ...) They might have the potential to do so, if they were organized on any principle whatsoever. They appear, however, to have been thrown together at random. In the instances where they are not random, they seem to be clusters of people from the same universe, which obviously has the effect of ensuring that whoever was in the minority in that universe will remain in the minority in that squad, and be thus unable to exercise their political will.
Like Hotel's collective punishment, squads, in principle, could serve a beneficial purpose. As applied, they are a counterproductive mess.