Rowdy is a bad influence on junior because he is bad and dont care about other people. Rowdy likes to fight and fighting dose not get you anywhere in life. Junior is not like that at all so if he starts doing things like that then he is getting that from Rowdy. The things that make Rowdy do things like that is his dad beats him and dose not show him love.  If Junior leaves him he is going to fight more and act bader. He wouldnt have anything or anyone to rely on or love. Junior is someone that Rowdy cares for.