"Of the hundreds of thousands of front line soldiers, only one claims summary executions and even he does not claim to have seen it.
Is every other soldier a liar?"

Could someone please explain the logic of this sentence to me because I'm buggered if I can see it.

So far Keith the only soldier to be called a liar is Harry Patch, by you. Remember when you typed " He was certainly wrong about it, but he never claimed to have witnessed such a thing"