What are the reasons Macbeth would kill King Duncan, and what are some reasons not to?

Yes,wants the glory of being King of Scotland. Yes,have dangled this promise in front
of him, and he's seen two of their other promises come to fruition.

But one
compelling reason thatfeels that he must move forward with killing Kingis that his own wife has
insulted his manhood. This isn't well-received in our own modern society, and it certainly
wasn't well-received by men who fought battles of valor to the death in hand-to-hand combat. She
provokes him in his hesitation, noting,

When you durst do
it, then you were a man;
And to be more than what you were, you would
Be so
much more the man. (I.viii.54-56)

Macbeth feels that he
has to defend his manly sense of honor and strength, not cringing in what his wife labels
as...