And homelessness can, in fact, be reasonably construed as Amazon's problem (or a problem caused by Amazon if we're a city thinking of letting Amazon in). The exacerbation of homelessness is an externality caused in part by Amazon's concentration of high-wage jobs in a small city and the subsequent skyrocketing of property values combined with mindless gentrification. So it's both a cause for concern when courting Amazon, and it's a form of pollution that they bring to town that it is not a priori unreasonable to hold them accountable for (to the extent that they are responsible for it).