Well... you've seen gasoline spill out of a car tank, and your mower refill gas can.
Have you seen LNG/NG 'spilling' out of a pressurized tank? Even if you roll it down a long hill?
Doesn't gasoline have a higher energy density than LNG/NG ?
Is a car gasoline tank more susceptible to explosion when it is full, or when almost empty?
Natual gas is also lighter than air so any leaks will dissipate rapidly.