The world of the son is a very interesting one. Unlike the father, this post-apocalyptic world is the one that the son was raised and I think also born in. All that he's ever told by his dad is that they are the only good guys in the world, and everyone else is bad. That's already a point of view that his dad is implanting into his mind. He has doubts sometimes, especially when his dad shot that guy in the head with a pistol.
One of the most interesting points that can be seen in this section of the reading is that you can see that the boy has his own train of thought. Based on what he knows, the world that is in his head is what is projected onto the real world. He'd always been living in fear of everyone else, and that he was one of the only good ones. Based off this, he's very apprehensive about the bunker-oasis that they find. Since he has such a deep-rooted trust issue with people that aren't his dad or himself, he can't get himself to completely trust the bunker as a safe-haven. He just can't get into his head that something so good can come so easily, made by people that aren't part of his family. Everything else in his life has been so hard, with food being very scarce and hard to find, with no beds, no shelter, nothing. This combined with the fact that someone else had made something that is actually pure and good, I can only imagine how hard of an idea it must be for him to grasp.
Also, the fact that he ends up thanking the people is pretty significant. Although his dad always is talking about God, along with the many religious references throughout the book, instead of thanking God, the boy thanks the people who were there before them. This reminded me a lot of why many atheists refuse to believe in God. Their main argument is, "how can there be a God when there is so much evil in the world?" I think that the boy thinks the same way. How can God exist if he has to live in this hellish reality? How is he supposed to thank or even begin to believe in God when anything good may come his way?