I think you misread my comment, at no point did I express that free software intents to support the existence of copyright. But free software and open source are obviously built on top of the copyright system, as you said (they are a kind of hack). So you obviously care about copyright frameworks and their various implementations if you care about open source/free software.
One can totally care about an illness, but not CARE about it much.
Free software movement abuses the copyright system to prevent anyone from “owning” the software and putting a fence around others' work when greed tells it's suitable to do so. It has no intention to support its existence. As people only have that mediocre system today, and believe in it, it is used as a tool to partially formalize something from a different sphere of values.