Grownup meaning someone who swallows the tripe that coems out of Brussels and Strasbourg, the former a cabal of unelected bureaucrats and the latter a mini-UN General Assembly. You may not have also noticed that K. also remembers what the eastern half of the anvil did in 1939. Let by-gones be by-gones. Sure, when they are actually gone.
no grown up means someone who can convince people to follow his ideas because they are good for europe.