I don't feel much sympathy at all in this situation.  War is war.  What some professor at Columbia says about how war should be fought is idiotic.  What value are words in war?  Pieces of paper?  War should be fought to win.  In World War II we leveled German cities and nuked Japan twice.  We didn't concern ourselves with preventing civilian casualties.  That would have seriously hindered us from winning the war, which should be the only point of going to war.  In the same way, the Saudis and this coalition should not concern themselves with protecting somewhat complicit Yemenis when it hinders their effort to win the conflict.  That should be the goal.  The idea of fighting wars with tweezers to prevent collateral damage is absurd, even if it means people like this father of eight die.