Protecting foreign service members is one of the most important responsibilities of the U.S. State Department. So, reducing the number of American diplomats in Cuba – as well as expelling Cuban diplomats from Washington, to emphasize the situation's gravity – is entirely appropriate, especially since we still have no idea what actually happened.
This story should remind us how easy it is to pull off acts of terrorism. With drugs like fentanyl and carfentanyl pouring into our country, officials should treat synthetic opioids as a terrorist threat in addition to a public health threat.
If someone's going to commit mass murder of innocent civilians, it follows that he's going to lie about it. Which is exactly what Bashar al-Assad did when he denied Syria used chemical weapons in the April 4 attack. What revealed the lie? Chemistry.