Bhishma abducted women:
Meanwhile the son of the ocean-going Ganga heard that king Devaka had a daughter endued with youth and beauty and begotten upon a Sudra wife. Bringing her from her father's abode, Bhishma married her to Vidura of great wisdom. And Vidura begot upon her many children like unto himself in accomplishments.'
-- An excerpt of Adi Parva Section CXIV
Krishna abducted women:
Of eyes like the lotus petals, and endued with great bravery, Krishna, vanquishing all the kings at a self-choice, bore away the daughter of the king of the Gandharas. Those angry kings, as if they were horses by birth, were yoked unto his nuptial car and were lacerated with the whip.
-- Excerpt of Drona Parva Section XI
Duryodhana abducted women:
Disregarding all the kings, he commanded the maiden to stop. Intoxicated with the pride of energy, and relying upon Bhishma and Drona, king Duryodhana, taking up that maiden on his car, abducted her with force.
Excerpt of Shanti Parva Section IV
Why was kidnapping such a prevalent custom of marrying women in ancient aryavarta?