He did as much 13 years ago in Iron Man 3, the second he dropped his guise as the Mandarin to reveal that he was actually Trevor Slattery. The efficacy - not to mention the morality - of this twist has been the topic of heated debate ever since, but no one can deny that Kingsley isn't utterly sympathetic in the role.
Some idealists set out to build a new community from scratch. They saw themselves as unusually clear-headed and logical - people determined to build a society based on reason rather than on the accidents of tradition. If there was a better way to do something, they wanted to find it. At first, the experiment went smoothly. They shared work, rotated responsibilities, and debated policy late into the night.