And it was just that(1) which had most disconcerted me in my dealings with him. When people say they do not care what others think of them, for the most part they deceive themselves. Generally they mean only that they will do as they choose, in the confidence that(2) no one will know their vagaries; and at the utmost only that they are willing to act contrary to the opinion of the majority because they are supported by the approval of their neighbours.

上面，我个人认为that(1)是强调句，that(2)是同位语从句。

对于act contrary to the opinion of the majority - 这里是形容词contrary to the opinion of the majority作act的修饰状语吗？