My point was that the idea that you can secure peace by building an army/weapons is, imho, fundamentally wrong, and history is riddled with examples (Though I am not saying that it's necessarely a bad idea to arm yourself!).Not entirely true, following the battle of Jutland the German surface fleet never left harbour again in force. The Kaiser was too worried about losing his Grand Fleet to a greatly superior RN force. Fisher's idea of overwhelming sea power may not of deterred war, but it worked partially by restricting any strategic impact the German Grand Fleet had on the outcome of the war by keeping it bottled up in harbour.
It's a shame Hitler didn't learn from that and divert time and money spent building white elephant pocket battleships and instead increase submarine production. If you look at the cost, time, steel use and crew numbers needed to build and man pocket battleships and convert that into submarine hulls/crews the war in the Atlantic would have been an Allied loss.
Incidentially your "White elephants" of WW2 and I add Fischer's "Scheme" and the fleet armament that takes place the first decade of the 20th century, shows mechanismens that renders a percived stable situation, instable. Both are examples of weaker navies challenging the otherwise completely dominating navy, that are forced to enter a new arms race to keep it's dominating position.
The millitary superiority of one power is always challenged by the weaker, that ofcourse can not tollerate being the weaker, the endangered.
Therefore arming yourself to safeguard peace, only leads to those, that you are arming yourself against, also starts to arm themselves.
Imo, what seems to work in safeguarding peace, is simply to render the war "unprofittable" for both sides. The MAD doctrine of the cold war is an example of that, In the words of De Gaulle, speaking on the french nuclear program; "I cannot think that any nation would attack 60 million or so french, knowing that the french would kill 60 million or so in retaliation"
In our time, the closely integrated global economy would likely also render most (edit: Large) wars "unprofittable".