It's simple - they are freedom-loving. Especially DJ. They are hooligans who love to disrupt public order, and do not always live within the law. When fate gives such guys a child, most often nothing good comes out of it. Needless to say that they know nothing at all about children except that they constantly yell and cause problems? They just don't want to say goodbye to freedom. With the opportunities it gives, they don't want to grow up that much. Minori is like a snowball for them that ruins all their plans, especially for Wingo. And deep down, Wingo hates it. And in this situation, it’s easier for DJ to pretend that this is not his child and Wingo (for some reason) does not condemn him for this.