How can I treat the subject of an essay objectively while still trying to persuade readers of my point of view?

How can I treat the subject of an essay objectively while still trying to persuade readers of my point of view?
Is your point of view objective? Why turn readers away from seeing the facts? If necessary... only provide subjective facts. Let your readers come to your conclusion.

How can I treat the subject of an essay objectively while still trying to persuade readers of my point of view?
Here's an example: Why are fire engines red? Well most fire stations have three engines; each engine has 4 wheels; 3X4 is 12; 12" is a ruler; Queen Elizabeth is a ruler; she has the fastest ships on the sea; fish swim in the sea; fish have fins; the Fins fought the Russians; Russians are red; fire engines are always rushin'