When social life is organised for the production of commodities people will start identifying with their their commodities. Once they tie their personal value to that of their commodity, such as a house, an assault on the value of their property is seen as equal to an assault on their person.
Housing becomes more than a commodity under capitalism. It's your retreat from the workplace, from exploitation, from capitalism. It's a coping mechanism based on intentional ignorance. Having poor people, living embodyment's of Capitalism's failures, shatters that reality.