Vito, we understand by your analogies that you feel that Michael may have been just in the acts that he committed, and that Michael himself probably felt that he could justify his actions. Your reasoning is not in question based on the analogies that you keep providing.
But tell me something ; did Michael ever deliberately violate accepted principles of right and wrong? Was Michael honest or dishonest? Did he use unethical practices to get what he wanted? Did he deal with corrupt people of authority and / or partake in corrupt practices with them to get what he felt that he needed?
Michael was a Mafia don. Obviously, organized crime includes activities that are severely morally questionable at best--for example, union racketeering, forcing shopowners to pay protection money, etc. (I am less convinced when people talk about lives being ruined by gambling and prostitution, it seems to me that the people who provide these services are not necessarily any more responsible for destroying the lives of those who partake of them than liquor store owners are responsible for lives being destroyed by alcoholism). But there are reasons why me and many others had a problem with Michael being labeled a villain on the AFI list of movie villains. Even if one considers organized crime itself immoral, most of Michael's actions in the movies seem justified given the context he is operating in. One could argue that killing other gangsters is not something immoral on its face, given that the people you're killing, such as Moe Greene, Barzini, or Hyman Roth, have themselves chosen to live by the same code of behavior you are. There are exceptions--Michael may well have been able to avoid submitting to Geary's humiliating treatment without killing that prostitute (although Michael himself may not have ordered this). But still, giving the context he is operating in, Michael appears to be someone who, while involved in numerous immoral things, does not seem to be a person one can simply label "immoral" and leave it at that.
I think me and others are also hesistant to label Michael immoral or a villain because of why he came to be a Mafia don in the first place. While he certainly may have gotten greedy and consumed with power, he appears to have come to be a Mafia leader at least partially out of a sense of responsiblity to his family, to take up the mantle when his father was sick and died. There is also the issue of admiration, although this is more an issue when assessing Vito than Michael. It's difficult not to admire how Vito came to the U.S. from nothing, under horrible circumstances, and became someone hugely successful and powerful, creating a dynasty of sorts for his family, even if that ascent involved shady practices. There is something very noble and admirable about creating one's own destiny (as Vito put it, refusing "to be a fool dancing on the strings held by all of those big shots"), even if doing so involves means that aren't so noble. I think this is perhaps the most important factor in being reluctant to consider either Vito or Michael a villain in the sense that one would consider, say, Charles Manson or John Wayne Gacy or Hitler to be one.
And I don't mean to beat a dead horse, but if you're simply going to condemn Michael based on the questions you asked about him and leave it at that, then you have to do the same with many famous pezzanovante as well. I won't name names this time, but all the questions you posed about Michael could also be answered in the affirmative regarding numerous famous politicians, including many that are highly regarded (at least on the whole) by the public and historians. One might argue that there's a difference in that, unlike organized crime, politics isn't inherently about any immoral activities, but nevertheless, the comparison is valid in that it shows how someone can meet all of your criteria for being an "immoral person" and still not be seen as such by many people.