War only bears massive profit for a very few
that profit is usually privatised (eg Margaret Thatcher finally paying off with tax money in the 1980s the napoleonic war bonds that had been bought by the Rothschilds, and had been paying interest since the 18 teens)
but, under democracy the cost is socialised. It's no longer up to a king to fund his own wars out of his own pocket or to borrow from bankers himself.
As the democratic replacements for kings don't have to bear the costs themselves, and their cronies can profit so much - they are much more willing to engage in ridiculous wars
like the war to make the world safe for Lenin and trotsky, Benito Mussolini, Adolph Hitler and the house of Saud
Or the one after it to make the world safe for Stalin, Mao, the Kim dynasty, Ceacescu, Pol Pot, Assad, and Saddam Hussein...
<edit> I forgot about the war to make he world safe for ISIS
British Tax payers only finished paying off WWii debts (I don't know how much of that to the Rothschilds and the Morgans) last year.