It isn't. Since the times of ancient Greece comets have been believed to be omens of catastrophes. There is no evidence to substantiate such claims. Comets can cause destruction when they collide with Earth. Halley's comet's orbit does not intersect Earth's, so there is no risk of collision.
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Comets and asteroids are superstitiously seen as bad sign in most cultures all around the world due to the fact that they have been linked to natural disasters in history. Halley's Comet, for instance, is seen as a bad omen.
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Edmund Halley.
In 1066, the comet was seen in England and thought to be an omen.
Some other examples of comets include Comet Halley, Comet Hale-Bopp, and Comet Hyakutake. These comets are known for their brightness, size, and visibility from Earth.