Fighting for a greater good?

Fighting for peace – this is one ironic statement, even when the villains and the heroes are clearly distinguished. But what good can come out of a fight between two genuinely good superheroes? This is the question the Marvel Cinematic Universe needs to ask and answer at the same time.
And that is because the actors involved in the Civil War have long lasting relationships (Black Widow vs. Hawkeye), have no reason whatsoever to become involved (Black Panther and Winter Soldier), have no reason to actually fights other superheroes (Vision and Winter Soldier). What could push these characters into taking part in Marvel Cinematic Universe’s Civil War?
We do understand the position of other superheroes (such as Iron Man, Captain America, Falcon, War Machine, and even Scarlet Witch). But why? What greater good could they believe to achieve by fighting each other and possibly killing each other? Wouldn’t this throw over board the very principles of the Accords, of gathering all superheroes under one banner?
There are two reasons I can think of. One is a major (although, not that big) death, which would convince Tony Stark to support the Accords. And the other one involves a hidden player. Head on to the next page for more!
