That latter link in some people's minds -- between low-income and crime/nuisance -- is a story in and of itself. Though there may be a wide-scale statistical correlation between higher crime and lower income, these are aggregate statistics that say a lot more about the desperation that arises from concentrated poverty ("Just get a job"? At what store? Selling what to whom? Who are buying it with what money?) than about any specific person. Making such assumptions of criminality in regard to any given low-income individual, simply because they're low-income, is just unfair. And yet it's one of the most common implicit assumptions in American political discourse...They said the number one question (or hostile accusation) they got from residents and passers-by was if the building was 100% low-income housing. (It is not)
This should come as a surprise to none of us, but in the minds of a lot of people there is a perfect 1:1 correlation between density/apartments and low-income/crime/"those people"
Not to mention, these are probably the same Tea Party types who think the world will end if the minimum wage is bumped up toward something livable. It's the modern equivalent of having one's cake and eating it too: Having one's $0.99-rather-than-$1.19 fast-food taco and still bitching when those who make it have the audacity to want to live somewhere nearby.