I get where your analogy is going but let me flip it on you. You're a soldier in the War in Afghanistan and you see insurgents strapping explosives to a child and sending him towards your position. How disgusted are you that they would do that?

In your example, it's soldiers with similar notions of war, with similar values. You and the Chinese guy both consider shooting machine guns at soldiers to be within the bounds of what is acceptable. But that's not what this is. This is decent people with one notion of war/politics against a group that will cross every line if they think it benefits them.

The right is continually shocked and disgusted at the left because the right has ideals and one of them is placing value on morality.