I don't know that I would call the practice of "displacing the homeless" as disgraceful, but I agree that the way the private security elevated the situation is. They shouldn't be defaulting to spraying mace, as one might spray insecticide, it should just be there as a last resort.

The disgrace belongs to you and me and the rest of capitalistic society who have let homelessness happen. Since we can't/won't house them, the only thing we can do is shuffle them around.