Housing prices are rising in Seattle because it's growing. And while Amazon might be the proximal cause of Seattle's growth, the fact remains that some cities in the United States must grow in order for the economy to, you know, fulfill it's debt obligations. Seattle does not have worse homelessness than other cities which are growing at the same rate, although cities with a population decline tend to have a surplus of housing which therefore becomes cheap. So unless Amazon is to be blamed for America's systemic inability to handle homelessness in growing cities, it's a little unfair to point the finger.