The decisions at Vienna would not be of value if the five powers themselves would not stick to them, or if the secondary powers could not be forced to obey them. There are many reasons why indirect approaches could be more successful than direct interaction, but these are situational exceptions to the rule that direct contact is preferable.
Reading example essays works the same way! Adolph Hitler's rhetoric was successful not only because of his personal charisma and his mastery of delivery, but because he spoke at the right time: the German people wanted a way out of its economic morass and its cultural shame, and Hitler provided them both with his strong, nationalistic oratory.
What could be done, however, was to create inclusiveness and exclusiveness inside the Congress itself: some were allowed to be deciFor a legitimate conference sion-makers; most were kept at bay.
Joking involves glimpsing the improbable and using upside down logic. The only plenary sessions were the opening and closing meeting of the Congress.
The mass of interested parties were included in the process through a series of festivities, but excluded from the day-to-day decision-making process. These powers could afford to keep the middle and smaller powers at a distance, as long as they could be sure that they could control them afterwards.
Norms, then, could not be universally adopted as the Conference did not have a procedure to allow for that. Another reason for integrating the French enemy had to do with the unreliability of Russia on the one hand, and the need to control the Bonapartists and Republicans in France itself on the other.