Every American has the right to speak out, to express views, and to serve as an advocate for all manner of issues and prospective leaders. But having rights doesn't necessarily mean they're valuable, or even useful at all.
Palin, who has repeatedly botched the meaning of the First Amendment, had the audacity to school eight of the nine Supreme Court justices, including the very conservative chief justice, on the First Amendment.
A funeral is an occasion at which mourners should be free to grieve without having to confront offensive messages. As a matter of common sense, this is reasonable. As a matter of First Amendment law, however, it is flat-out wrong.
The dispute over the mosque is a lot like a hypothetical German-American march. Just as it would be wrong to treat all German-Americans as if they are Nazis, so too is it wrong to treat all Muslims as if they support terrorism.