Why does maniac take Mars bar to the pick wells before the mcnabs?

Maniac takes Mars Bar to the Pickwells before the McNabs to showcase his desire to fit in and demonstrate goodwill. He recognizes that the Pickwell family is more welcoming and accepting, contrasting with the McNabs, who are more confrontational and aggressive. By bringing a treat, Maniac hopes to build a positive connection and create a sense of belonging in a community that has largely been unkind to him. This gesture reflects his longing for friendship and acceptance amidst his tumultuous journey.