Sorry, the "Again" was ill-chosen, I was reemphasizing someone else's point, not my own, and should have expressed that more clearly.
You did correctly state one implication of my point. The complete point was that the essence of free software is that software creators can scratch their itch in whatever way they please and if downstream re-distributors and users don't like it, they're free to change it. That does imply that default settings are arbitrary, at the will of their creator.
Since neither of has any evidence as to the distribution of opinions across the user base, your estimate of a "tiny minority" has as good a chance of being right as any other. My own guess is that most users would be comfortable with supporting the flag by default if the warning behavior was changed to allow an override action as part of the dialog and to provide a better message (without the misleading word "DRM" - a simple statement that the author has disabled copying text from the document). I, for one, DO appreciate knowing when I'm breaking the author's expressed rules for using the document.