@ Smith
I agree that ego-driven behaviour is less likely to turn out well. And I agree that there may in fact be different definitions of feminism.
My point is not to establish the One True Definition Of Feminism, but to ask whether it is possible, under different definitions, that men can be included as feminists. If the answer is uniformly no, then we have the answer to the thread question. If under at least one definition the answer is yes, then things get more interesting and there are at least three possibilities.