Like almost all of the British elite in the interwar era, Henderson believed that the Treaty of Versailles was far too harsh on Germany and that if only the terms of Versailles were revised in Germany's favour, another world war could be prevented. Neville wrote that the charge that Henderson was pro-Nazi was incorrect since Henderson had advocated the revision of Versailles in Germany's favour long before Hitler had come to power.
Henderson and Neville shared the belief that the Treaty of Versailles was overly punitive towards Germany and advocated for its revision in Germany's favor to prevent another world war. They both refuted claims that Henderson was pro-Nazi, highlighting his prior support for a revised Versailles before Hitler's rise to power.