Why? How can we improve as a society if we move what we don't like out of sight?

I was particularly shocked when I came to the US by the sheer amount of poverty, disparity, etc. But I recently realized that the situation might not be that much better in Europe, it's just that poverty and disparity is usually moved to the suburbs and less visible.

What is the premise of this response? That unless we finally and completely solve the problems of society, nobody must be allowed to have streets free of needles and feces, lest they forget that addicts exist?

I'm sorry, I don't think it's immoral for me to want to live in a neighborhood where all my neighbors are housed, and keep their feces and drug abuse indoors.