The challenger before the leaking flame of the solid booster torched a hole into the dewar.
When NASA launched the first astronauts to the Moon. Propellants for the Saturn V's second and third stages were liquid hydrogen and liquid oxygen. They were stored in 850,000 gallon spherical containers about 1,500 feet from the pad and I presume not next to each other.
Once every airport had a setup like that, an accident would only be a matter of time.