That's the best things are going to get. Half the people Wash has talked to are ready to give up, and it's...worrying doesn't even begin to cover it. "I don't believe that, and I don't think you do either. You wouldn't have made it out the other side of the apocalypse if you gave up that easily." It's not the most comforting thing he could have said, but right now he's just trying to get something out of Dipper. Anything is better than apathy; they can move on from there.