That is called the First Amendment. The fact that others in the world discuss US politics is not a problem.
The deplorable state of US politics is the problem.
No citizen of the US needs to be protected.
We will find when politicians better represent Americans, not big money, no protection is needed.
Same goes for media. When do you see a solid discussion of net neutrality presented in the mainstream media, or an economic story told from the labor point of view? Two super easy examples.
People go seeking elsewhere, and with all of that comes these worries over people actually discussing policy!
Shocker. It's as if having a real conversation is a threat somehow.
Perhaps it is. Perhaps it should be.