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Your "trap" was obvious and your analysis is ridiculous. By your argument we are not allowed to defend ourselves against a full scale nuclear assault. Instead we must simply accept our fate and kiss our asses good bye. If your argument were true then nuclear war would be far more likely as the kooks would simply wipe the "civilized" people of the world out.
Your argument is exactly analagous to telling a person that is being murdered that if they respond with lethal force they will be guilty of murder.
In short, you are obviously completely unaware of the concept of proportionality in warfare. This concept is far older and far more basic than the GCs or even the HCs.
So long as our response was a proportional response to Canadian aggression then we would not be guilty of any war crimes.