In the Vault Dweller's memoirs, he says as such "I found myself in Junktown. It was here that I learned the most important rule of all: doing a good thing sometimes means being a very bad person. My memories of Junktown are tainted, and I feel no remorse for my actions in that place. It was there that I came across a dog, who adopted me and was my faithful friend from there on. I miss Dogmeat to this day. While Junktown was a city of traders (and traitors), it did not have a water-chip." What is he alluding to? Helping Gizmo seems extremely out of character even for something he says he regrets. I just can't really work it out.