Syrian citizens deserve better than what they’re getting at the moment. On top of being gassed by their own leaders, they are now dealing with a weak response from the rest of the world. Inspectors from the United Nations Security Council are on their way to Damascus to find out if Bashar al-Assad really has gassed his own people again.

On Tuesday, an attack on the rebel-held Syrian town of Khan Shaykhun killed 58 people. It is not immediately clear which regime-backed force carried out the attack. One thing is clear: people were killed...