I'm hard times, charles dickens's purpose in including sissy in the selection is to show that

There is some parallel between Sissy’s story and Dickens’ own. When he was 12 years old, Dickens was sent to work at Warren’s Blacking Factory (Coketown, come on) after his father was imprisoned for debt. Claire Tomalin asserts in her superb recent biography about Dickens that, when he was rescued by his parents neither he nor they uttered a single word about it to one another. So I suspect that Dickens was strongly attached to Sissy in a very personal way. And for me, a world without Sissy Jupe would be a world without Dickens.

Ialways thought that he thought it wasn’t fair because he thinks that people should be able to experience things and think outside of the box, or see color and add brightness and happiness to their lives but idk.