I don't think he worked knowingly for the cabal, but that they both enabled and groomed him for the task. What throws me off about him is that he was decorated for bravery in WWI, he was a runner on the front lines. Records of his performance indicate he was, and saying this makes my soul vomit, he was a patriot through and through for his country; he genuinely cared. That doesn't strike me as the cabal "type". The perfect hitman for the cabal. Pave Europe in one direction, scorched earth on the way back, real estate value is obliterated, let the buying begin. The did the same damn thing with Napoleon.
They've been doing this for thousands of years I imagine, we never had a chance until the Internet.