I'd say the disagreement rests upon this straw man.
The issue is not whether users are allowed to use the non-Free firmware. Nobody's trying to stop them.
The issue is whether we, as a community, should encourage that. Whether we, as a community, should help vendors of hardware that requires non-Free Software capture customers. Whether we, as a community, want to encourage users to be happy slaves, keeping them comfortable and ignorant so that they will even invite others into the trap and feed the aggressors, or take a stand against non-Free Software with us.
The question really boils down to whether or not GNU+Linux distros and Linux should induce and help users accept the oppression from non-Free Software suppliers. The alternative is to refrain from aiding users in this regard. Which, again, doesn't mean *preventing* users from doing so: they wouldn't be stopped from obtaining and installing the non-Free Software, from those who *want* to oppress users.