Najib just as Mahathir before him does not believe in organic growth or the intrinsic dynamism of free people. His method has always been collectivism, concentration of power and government does know best. That is why he is actually continuing with the Mahathirist policies of absolutism and economic cronyism.
The partaking of the ruler in such a gathering only serves to convince people that the institution which is supposed to be the fountainhead of justice renders itself to manipulation? Rulers should stay above politics and not let them be compromised by overweening political ambitions of some people.