I think I'm currently siding more with William James in this (as from the wiki above):
'James' defence of the great man theory can be summarized as follows: The unique physiological nature of the individual is the deciding factor in making the great man, who, in turn, is the deciding factor in changing his environment in a unique way, without which the new environment would not have come to be, wherein the extent and nature of this change is also dependent on the reception of the environment to this new stimulus ... James argues that genetic anomalies in the brains of these great men are the decisive factor by introducing an original influence into their environment. They might therefore offer original ideas, discoveries, inventions and perspectives which "would not, in the mind of another individual, have engendered just that conclusion ... It flashes out of one brain, and no other, because the instability of that brain is such as to tip and upset itself in just that particular direction."
'James' defence of the great man theory can be summarized as follows: The unique physiological nature of the individual is the deciding factor in making the great man, who, in turn, is the deciding factor in changing his environment in a unique way, without which the new environment would not have come to be, wherein the extent and nature of this change is also dependent on the reception of the environment to this new stimulus ... James argues that genetic anomalies in the brains of these great men are the decisive factor by introducing an original influence into their environment. They might therefore offer original ideas, discoveries, inventions and perspectives which "would not, in the mind of another individual, have engendered just that conclusion ... It flashes out of one brain, and no other, because the instability of that brain is such as to tip and upset itself in just that particular direction."
