Roberts revealed himself to be a weak minded liberal who believes in multi-culturism and that to deny Obama his signature legislation would have been an act of racism. As Jonah Goldberg explained it in his book, Liberal Fascism, to be race neutral is to be a racist. Roberts did not want to be seen as a racist.
I guess, it is possible to intelligent and weak at the same time. Without the belief in God given rights, we are caught in the void, where power decides all the questions of the day. Is Roberts an atheist? Was he easily convinced that there is no such thing as God given rights because he was afraid to stand up and say that he believes in God?
Being intelligent is nothing without courage and sound principles. CS Lewis, when writing about education, said something along the lines that schools are merely producing “clever demons” or something of that sort.