Put yourself in the city's situation. You see a lion roaming through a subdivision and you don't have a tranquelizer gun, are you going to let him prowl, maybe break through someone's sliding glass door and murder innocent people? Or are you going to be rational and shoot the lion and protect the public?
Also, they attempted to tranquelize a tiger and he became very agitated and came after the officers? I guess the officer should surrender to the tiger.
I understand people's stance here, but in my opinion saving a couple lions/wolfs/bears/tigers is not worth the loss of one human life.
It's unfortunate that the preserves owner is dead, he should have been punished to the full extent of the law.