The lines from "The Tragedy of Macbeth", by William Shakespeare, that would support the answer to the question of why Malcolm and Donalbain feel they need to leave Scotland C. Where we are,/There's daggers in men's smiles. The near in blood,/The nearer bloody. Malcolm and Donalbain are King Duncan's sons. Their father has been murdered. They decide to go one to Ireland and the other one to England. In Scotland, they don't feel safe.