The AHBs have hundreds of cases trying to evict tenants for anti-social behaviour. Presumably when the AHBs succeeds in getting the tenant out, he is sent back to the Council for housing and they'll send that person straight on to the naive RAS landlord. Problem solved, off the AHBs hands, off the Council's hands and straight in to yours for you to deal with for years to come!
This scheme should carry multiple warnings.