Upbeat is for people who want to feel good about their cause: the reformers, the progressives, the revolutionaries, the utopians, the collectivists, and the rest of the altruistic scum of the earth. Why do these people want to feel good? They want to feel good in order to convince themselves that they are good.
The prevalence of mobile homes does not correspond with the prevalence of poverty, or with much of anything else. All that can be confidently said about America's mobile homes is that they are massed in places where you wouldn't want to be in one. Florida's mobile homes lie athwart the path of hurricanes. Georgia's are in the way of tornadoes.
Positive rights are the right to shelter, the right to education, the right to health care, the right to a living wage. These things are - these are, I would call them, more properly, political rights rather than positive rights. And they are extremely tricky, because now we are dealing with things that are zero sum.