I don't believe for a minute that any commercial enterprise would deliberately encourage vandalism of their property Jim, that argument just doesn't make sense.
Additionally I'm sure everyone in the town knows where the ASs have been housed, they do not need to rely on door colour to find them.

Perhaps you are suggesting that foreign AS should be placed amongst local people one or two per street, but I'm sure that would be very difficult to organise and would involve the decamping of local families.....I don't think the AS would be very happy either as they would probably feel isolated.

As far as I can make out, the houses were empty, then bought and refurbished specially to accommodate these people, that is why there are so many AS housed together.

Do you believe in "bogey men" Jim?