I think that trying to develop your own ethical/moral reasoning on a subject this complex is quite haphazard; you seem to be trying to carve-out/describe a nuanced position, but there are a lot of problems with your reasoning. To be clear, this is a tough subject, and I am not trying to impugn your motives in any way.

My view is that government authority is at its perigee when it comes to free speech, and that any regulation is both problematic and suspect. This stems from Huemer's convincing arguments in "The Problem of Political Authority".