I think that the idea that it's the government of a civilian population that is at fault is sort of interesting but ultimately incorrect. If you are the leader of France and Nazi Germany's superior numbers and arms have overrun you, is it your fault that thousands of your people have died and will continue to die in a unwinnable war? No, that's ridiculous - the aggressor is ultimately at fault for that.
But I do think the leaders of France could be blamed for having poor intelligence on what exactly was brewing in Germany, for having inferior troop numbers, training and equipment, for not having the right alliances in place that would make the Nazis blink, and so forth. The leaders of France did let their people down in some ways. I wouldn't go as far as to say that the ultimate burden of guilt fell upon them, though.