Take children playgrounds for example - you have them where you have a lot of families with kids, right? And that makes sense since that is kind of public infrastructure supporting the needs of a certain population.

However, homeless people are not considered as population, they're considered as aberration. If we consider them as just another population we need to support with public services, maybe every neighborhood would have facilities for homeless population, like you have facilities for pets owners, parents, as you have parks, bike trails, etc.