There are a lot of people who are prejudiced about gangs in general. The moment that the character has joined the gang, a lot of readers already started to think that there are going to be really bad consequences for this. True enough, Andy got hurt in the end. People should remember that there are different circumstances that may lead people to make decisions.
Some of these decisions will be good for them. There are also some decisions that will lead to mistakes. It is important that when people make mistakes, they will learn from them. Hopefully, people will always be given a chance to correct their mistakes.