Insufficient formal complaints
People experiencing problems have many disincentives to discourage registering their complaints. They do not want to be a bore or a threat to their neighbours and to officials, nor to face hostility, especially when they feel uncertain. Often they are afraid to mention suspicions because the consequences can include having to move, losing their job or seeing their house devalue. Sometimes they are intimidated, or even physically assaulted. They may feel responsible or guilty about risking the security of their family and friends. Some people may become too depressed to bother since they do not think it will help anyway.