Diário de um ladrão de oxigênio

The intimate perspective really drew me in, but I wonder if the author intended it to feel like a true confession or more of a literary device.

The protagonist's self-destructive path made me uncomfortable, yet I kept turning the pages. Is that just good storytelling or a reflection of how compelling the writing is?

Despite the protagonist's harsh choices, I found myself understanding his pain. What do you think the author was trying to show about human vulnerability?