<human>: Summarize the given text in a few sentences.

background:  the german high court and the european court just declared that preventive custody is illeagal. three convicted german rapists were held in prison after the end of their sentence and are now suing for financial compensation.

now a lot of my friends started a rant. the usual stuff "ppl like that should be killed on the spot" "they should stay locked up forever".
so i decided to point out, that just keeping someone in jail, after their time was served goes against the very thing, prisons were made for - the protection of the community AND the rehabilitation of the convicted and that even the worst kind still have rights and that we have a moral obligation to judge in a fair way and uphold the law, no matter if we personally agree with it, or not.

reddit, how can i get my point across to them in a way that reaches them?
<bot>: friends say convicts should be locked up for ever, even after their sentence has been served. trying to convince them that its not that easy and that a lot of different factors play a role.