Why Mr arable want to kill Wilbur?

Mr. Arable wanted to kill Wilbur, the runt of the pig litter, because he believed he was too small and weak to be of any value. Farmers often cull animals that do not meet certain standards for health and productivity. However, this plan was ultimately thwarted by Fern, who pleaded for Wilbur's life, seeing his potential and valuing him as a living being rather than just a farm animal. Fern's compassion and determination saved Wilbur, leading to his eventual journey as a beloved pet.