First, density is obviously cheaper, and many people already begrudge homeless people sleeping outside even though that doesn't cost anything. Second, even if a person is addicted to drugs, they still need a place to live. So evicting them doesn't actually solve anything except your business risk. Third, NIMBYism is almost omnipotent as a political force in most parts of the US worth living in. You aren't going to convince people to let poor people or people with problems live near them. They will fight like hell to stop it, and many will be wealthy or influential.