This is a distraction. Prison needs to be abolished. Let's concentrate on that instead.
And if like many of my lefty friends by "abolish" you actually mean something that doesn't even come close to meaning "abolish", you're just causing problems with your abuse of language.
If there isn't punishment, then nothing stops anybody from getting a group of friends together to dish out punishment. It'd be like Somalia. Eventually, if the group gets big and well-organized, it might be recognized internationally as the legitimate government.
Here’s a handful of examples of reducing prison intake
https://www.mic.com/articles/109138/sweden-has-done-for-its-...
https://www.swissinfo.ch/eng/youth-offenders_balancing-punis...
https://www.theguardian.com/world/2019/dec/12/why-are-there-...