Why is identification of a wind shear of vital importance for the crew and the passengers?

Why is identification of a wind shear of vital importance for the crew and the passengers? Paraphrase: Why is it hazardous not to identify a wind shear in time?
Wind shear is a very dangerous in case it is formed near ground. If pilots miss wind shear, they might collide with the ground, lose the separate or overshoot the runway. The cases of runway excursions are possible due to wind shear. In case pilots have wind shear warning on their final, they have to go around.

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