You are actually setting up that scenario... Force Google, and you admit government authority to establish content. What makes you think they won't use that precise precedence and apply it to gun makers?
Let us keep things separate. I am in favor of anything that destroys Google. I regard it as a threat. If we could talk ISIS into attacking it and destroying it, I wouldn't mind. If we could infest it with Termites, that would be okay. If we can call Shiva the Destroyer to drop a space rock on it, I would not object.
An effort to use the Government to smash Google is not primarily about the Government setting up some sort of control over Google, It's about using the biggest rock I can find to smash the D@mn thing.
I am all about Google getting destroyed, not about letting the government regulate anything. In my thinking, the government just happens to be a convenient tool that can help with the job, but the job is breaking apart that power structure so it no longer appears to be the threat that it currently appears to be.
If the Courts spun it apart like the Bell Group, I could live with that. It would still be "private", just a lot of little "privates" instead of one great big one.