"You put these people into decent schools, they will likely cause upset for others, you put these families into decent areas, they will cause decrease in house prices and cause increase in crime and other social hazards."

These are the same arguments put forth when Seattle was forced to integrate the Black population. None of it proved to be true.

Vancouver has social housing that requires tennants to have a mixed income. Most development is required to have a certain percentage of low income suites available.

Your fears are unfounded. Poverty is not contagious and by providing alternatives, many have had the opportunity to raise their children in a world of opportunities and positive role models. In a ghetto situation, crime breeds crime and poverty breeds poverty and the cycle continues.