In the Marvel Universe the Xandarians operates a prison called the Kiln where the guards are corrupt and cruel. Do you think in this universe there would be naive idealists who would have a problem with this?
Perhaps Agent Phil Coulson and SHIELD could rally these sentient life activists could lead a raid on the Kiln and shut it down for good.
Maybe a idealistic military type like John Sheridan, Captain Anderson, or Paragon Commander Shepard would lead the activists.
If Marvel ever did a story like this it could be a commentary on private prisons and police brutality.