Why did Hades kindnap Persephone?

Answer 1

Zeus had promised Hades his daughter Persephone as his wife, Zeus neglected to mention this to Persephone and her mother Demeter; Hades had created a flower for Persephone, and Persephone and her maiden goddess companions found it in exploring a field of flowers, Persephone plucked the flower and Hades thought this a acceptance of his love for her, and took her to his realm where he found out he had kidnapped Persephone (who in some myths isn't at all opposed to being Hades' Queen) and when Demeter ventured into the underworld Hades greeted her and said Persephone was allowed to return if she had not eaten of the food of the underworld - she had, so she spent the winter with Hades and in rest of the year with her mother; it goes differently how long exactly, but winter is the return of the sorrow of Demeter having lost her daughter.