The ironic thing is that too many Americans will watch the news and see a bunch of Muslims in Afghanistan chanting "Death To America," and think this is A) an unprovoked reaction, and B) representative of Muslims worldwide.
Let's put the truth to it:
1. A professional American
2. Muslims in a place that has been living in stone age conditions since at least 1978, who are under military occupation by troops from nations with mostly Christian populations that have significant political factions and popular cultures that constantly demonize Islam, hear "Death to Islam." Again.
3. Because they have not lived under a constitutional government for some time, and have no experience with ideas like the First Amendment, it is very easy for our legal protection of "Death to Islam" speech to appear like a legal endorsement of "Death to Islam" speech.
4. Many Americans ignore items 1 - 3, and watch the news to see Muslims burning flags, effigies of the President, rioting, and killing UN workers.
5. Many Americans use that to justify their continued xenophobia and religious bigotry, which is far more of a historical and existential threat to America than Muslims or Sharia law will ever be.
All just a part of the plan.