Those are completely different lines of reasoning. Was the flat tire the fault of the nail in the road or was it the fault of the people for not sufficiently funding the county government such that they cut back on the schedules street sweeping?
They can both be true simultaneously. It can be true that a thief is personally at fault for breaking into the bank and it is the fault of a deteriorating economy that put him out of work. Causality is not a singular event, it is a host of events that culminate into a larger issue. Placing BLAME is a fools errand. Then there is the issue of "or" where "and" is appropriate. The question is over simplified.
Try looking up "Who started WWI?"
"Germany is often considered primarily responsible for World War 1 due to its aggressive foreign policy, including backing Austria-Hungary in their conflict with Serbia, violating Belgian neutrality to invade France, and its perceived desire for a large empire, which led to a perception of them as the primary aggressor in the conflict; this, combined with the complex web of alliances, ultimately triggered a large-scale European war. "
Thinking is a procedure. There are good procedures, like surgical procedures, that answer the question, that solve the problem. Then there are bad procedures that kill the patient. Thinking can follow a good procedure, like the scientific method or can lead to insane conclusions.
My question is; why are you trying to over simplify the issue and blame everyone else but Germany? Why do you believe your thinking is better that all the historians of the world?