The FSF defines freedom as the four freedoms. Copyleft is about preserving those four freedoms. Copyleft is still free software in terms of the four freedoms. Sure, you could take freedom as being able to do completely anything (or more things than just the four freedoms), but this is like saying the declaration of human rights is bad because it doesn't give you the freedom to enslave others.

So the question comes down to whether or not you think nonfree software is a bad thing. If you don't think nonfree software is bad, then how does it hold that you're saying you care more about user freedom than those who use copyleft?

To me, those who really like and care about freedom to use, study, modify and share software have no problem with copyleft. The people that seem to have a problem with it seem to just want to deny users that freedom. That's really what it is all about. I don't know how on earth you came across this as being like "War is Peace, Freedom is Slavery, Ignorance is Strength", when not having the four freedoms in the case of nonfree software is the real slavery here. And copyleft prevents such nonfree software.

TLDR haiku by RMS:

    Using GPL
    is encroaching on our right
    to encroach on yours

BTW, the LGPL, GPL and AGPL licenses are all "open source" in the sense that they are approved by the OSI, who are the ones who created and defined the term "open source" in the first place. So saying the GPL is not an "open source" license is technically incorrect and confusing.