The teachings are completely consistent. The consistence is as such; only in the condition of imminent danger can one consider killing a human.
not quite accurate, it cannot be the intent, but can occur as a side affect
We know that innocent people are and have been executed…
not using catholic standards. Those errors in prudential judgment are due to abuses in civil systems
I am not an expert in the history of how and when the just war doctrine has been applied. However knowing what I do about human nature, and history in general, it seems unlikely that the doctrine has never been applied in questionable circumstances. It is understandable the acts done in the instinct of immediate self preservation are viewed differently. But the application of that caveat in this broader area might not bare careful scrutiny.