Gasoline doesn't ignite with a cigarette butt because the butt doesn't have an open flame. It doesn't mean that gasoline doesn't burn. If it didn't burn, how would our engines be working and why do our gas tanks eventually run dry?
Yes, greed can be evil, but it isn't the root of ALL evil. But it's easier to put into one sentence.
Gasoline in liquid form will not burn. The vapors are a whole 'nuther game though.