(JNS) — We Americans seem quite capable of separating ourselves into fractious groups without the help of our enemies, but that hasn’t stopped many, especially the Islamists of the world, from using the death of George Floyd to fuel our divides.

U.S. Attorney General William Barr warned on June 4, that “hackers … associated with foreign governments” have been using Floyd’s death, “playing all sides to exacerbate the violence.”

Later that day, something alarmed the New Jersey Office of Homeland Security enough for it to tweet a warning about “fake social media accounts … post[ing] content in or...