Moriarty is always so confident about his intelligence and capacity,and that's why he can build a crime empire.The competition among the top two smart people are always so awesome!
It shows Moriaty was so confident of his brilliant intelligence,which made him blind to the possibility that Holmes was capable of threatening his crime emipire.Maybe it was exactly his arrogence beneath his wisdom that led to his failure eventually
He is really madcap.He is so confident about his talent and there is no denying that he does have the qualification to be proud,but he can't change the ending.No one can change it.