leaders in any political sense or form tend to be ideally motivated. their source of motivation stem from many factors such as their upbringing, life experiences, education etc.
there is no "correct" political model, only one that suits the agendas of the administration that has been enstated at that time. russia became communists because of the severe autocracy and class division that existed. lenin himself did not conform to the precise model of revolutionary marxism because he saw the need to adapt to the social situation. by putting the party foremost it cancelled the core of communism (i believe anyway), i.e. an order of no classes. however how do you enforce something that is only theoretically ideal and does not account for how it should me implaced.
for most people communism equates to authoritarianism and totalitarianism because that is what history has shown (it doesn't however, mean that it is the only example of communism). in order to enforce this political structure those in power use repression as a means to stifle opposition through censorship, curtailing of freedom of speech, secret police etc. fundamental communism didn't work and will never work due to the nature of humans. there has never been a "communist" country that was indeed communist, according to the marxist model. humans have compulsions and you can't repress them, in the same breath lord alcock's adage "power corrupts, absolute power corrupts absolutely" is true when you look at history's dictators. seraphim was right in claiming that had che lived, he would most probably be caught up in despotism. look at his comrade fidel, look at marcos, stalin, saddam, mao. they head/ed regimes that supressed their people even though their intial intent were idealistic.
che encapsulates the notion of liberation and emancipation, though sometimes his story gets lost in romanticism. his story should be regarded just as much as the icon. the problem with some of the youth is that they willfully fall in to the deified che, or most probably fall in to the commercial image. like ntb said it is very ironic that the one thing that he was fighting against is the one thing that is keeping him alive. he would probably roll in his grave if he saw what's been done with his image.
essentially though we look at che as a communist martyr and personification of humanity's irrepresible revolutionary spirit. you aren't born evil, just as you aren't born a hero, and like all of us, ernesto was human too.