[pvn]

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b. The first owners converted common objects or potentially other-owned objects into personal property. They took objects in the use of all or to others and made them their own. This conversion without compensation of other community stakeholders is theft.

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The trick here is in the conflation of "common objects" with "potentially other-owned objects". Saying that owning something is "bad" or "undesirable" because someone else could own that thing makes as much sense as saying that killing Mr. X is bad because someone else could have potentially killed him.

Now, specifically why that conflation is bad:

Taking "ownership" of something that is "owned" by some group of people is "bad". I will no doubt agree with this. But to make this argument you have to accept that the group owned the thing that is being stolen. Property can't be theft without property already existing!

Taking ownership of something that is unowned cannot be objectionable. If nobody owns it, what objection can they have? If they DO have an objection, they must have an ownership interest (or at least *believe* that they do - and if you can explain how you can believe that you have an ownership interest without believing in property, then we can go a little further).