FIRE CAN WARM OR BURN (How is fire described in the first scene of the book? Is it helpful or destructive? Explain.)

In the first scene of the book it described fire being destructive, The fire man spraying  kerosene with his hose towards a building showed an expression of enjoyment of seeing a building burn down. The kind of expression a crazy person who likes burning things would showed. In the first scene it showed fire being destructive but later on the story gives use an explanation on why fire men are burring down buildings. In this future building become fire proof so the only use for fire men is burring down buildings that aren't fire proof. Could you imagine this happening later on in the future!