All fiction has some amount of politics in it because fiction is usually about people, and people generate politics. You cannot explore the human condition without exploring the environment in which we live. Everything that affects us is connected to politics, which is why you cannot keep it out of fiction. Even if we try to keep it out of our writing, our unconscious biases will be present. Some of the best writers have allowed political ideas to find abstract form within their fiction, and the fiction is better for it. Indeed, there exists well-received fiction that is expressly political – Animal Farm, for example.
TL;DR: Politics exists; therefore it influences fiction.