IMHO, the buck stops if an airport meets the ICAO rules. I reckon ICAO rules are a very good balance between risk and cost, and they have stood the test of decades of time.
Overun,
thank you for your clarifying note. In addition I can tell you that any local/green initiative/party will fight any sealing of any area close to an airport that is not justified by any international regulations and even those that are with their utmost energy, making it impossible for airport planners and willing politicians to get that done. That's were we are, much before hotels and hangars come in play.
3NM