It's a very grim book, but it's also fundamentally about the goodness of people. The setting and the plot are bleak, but its outlook is, in a way, hopeful.

At least that's my takeaway. If someone else found it purely depressing I would understand, but I feel differently.

You nailed it. I have a full sleeve tattoo with elements nodding to The Road. For me “carrying the flame” is the lasting message of the book and it’s one of hope and courage.