This is a really good post. It opens up a big can of worms as the saying goes.
We are living in an huge universe. There cant be just one of any thing. So prisons must exist else where. Just like on earth there are prison systems in every country.
Why not in every galaxy ?
Just as it is said the country of china are jailing political prisoners and jailing others who are sentenced to death and their organs harvested then that is probably done in the universe too.
Then there has to be a group to run it ie prison guards of some kind. and someone has to be paying to keep them there in man and materials or actually paying some kind of money.
This opens up a big topic and one that could be viewed.
For instance how about viewing another prison planet and if the inmates KNOW that they are in one. Which they might not know then it would be very enlightening to find out what their "crime" was.
Also who are the wardens etc. We may find out that some of these aliens that are said to be helping us and getting us ascending to God, a higher plane of existence etc are actually running or paying for others to run some of these prisons.
Very interesting post !