The airport itself carries insurance so why the need for every individual hangar to have compulsory insurance?
Pretty standard in commercial leasing for tenants to be required to maintain their own insurance.
Is there a compulsory $20 or $30 million 3rd party property damage insurance obligation imposed on the owners of the houses?
Most house and contents insurance has this much. While not compulsory, how many households realistically wouldn't have it? If they don't have it, then at least
your insurance will pay up while you take them to court.