Why are fire engines red?

A fire engine has 8 wheels and carries four people.
8 plus 4 is 12.
12 inches is a foot.
A foot is a ruler.
Queen Elizabeth is a ruler.
The Queen Elizabeth is the biggest ship on the sea.
In the sea are fish.
Fish have fins.
Fins fight the Russians.
And Russians are red.

Besides, everyone knows that fire engines are rushin'.