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Illustrated in the scene following Macbeth saving Duncan, what was the latter's reason for fearing and/or hating gargoyles? We know very well why Gillecomgain hated Demona and her kind. It's easy to guess why Duncan's son, Malcolm Canmore, hated them because of the part they played in Macbeth becoming king of Scotland. So, why did Duncan want to destroy Demona and her clan before he came to suspect that Macbeth was conspiring against him?
Because Macbeth seemed to have a relationship with them. And because he couldn't control them. And because they were powerful.