Mental Health Treatment And Stigma In Nigeria

Has anyone else ever noticed the amount of mentally ill people running in the streets in Nigeria? I would like to blame this on the lack-of-knowledge and money that the government uses to support homeless people in general , until I realize that many of these people are not born homeless, but are the children on middle class people! There are people that actually abandon their children or let them run away due to the embarrassment they feel having them around. It also may be due to the financial pressures of raising such a child in a country like Nigeria, but I still can't understand how such a thing could still  be done in these times? And why is there no focus on control and treatment of the physically and mentally impaired in Nigeria?, since it is an obviously prevalent problem in our country. I also find that people are more reluctant to adopt, marry, or even associate with one that may have a mentally or physically impaired family member, even if the disability has been proven to not be genetically spread. In a country that values family as much as ours, how can this continue?