What to do regarding Syria?

The chemical weapons attack in Douma, Syria, on 7 April 2018 by the military forces of Bashar al-Assad, brought renewed calls for international action to protect civilians and resolve the brutal internal conflict that has persisted for over seven years and produced as many as half a million deaths. Despite calls for action by many Western governments, direct action and intervention have generally been in short supply, perhaps in part because Western observers do not perceive Assad as a particular threat or sufficiently villainous to warrant strong action.