Then you don’t have a strong understanding of human nature in general.
Even perceived slights make people mad. Trying to rationalize the actual value of a 3 day early start in the long-term is what Blizzard probably would like everyone to do so they can look better, but it’s not going to work. The hate now is nothing compared to what it will be in a year when the game is about to actually come out. Consider this a minor sneak-peak.
Players also are already paying $15 a month for this game on top of box prices and many have put thousands of dollars into this game for years. We made Blizzard what it is today and treating some of their long-term players like second class citizens so they can make even more money is a disgusting way to treat the customers that made you into the company you are today.