That language communicates both fact and feeling is one of its great powers. There would be no literature if it did not. Language only becomes "slanted" (deviating from the upright) when it is deceptive or manipulative rather than persuasive. Propaganda--political or commercial--slants language in an attempt to deceive the audience into accepting a conclusion without question. But careful writers will be aware of the way their language presents an opinion, and careful readers will be conscious of the often deliberate slanting of language in the world around them.
We are appropriately wary of accepting information passed on to us from an unreliable source. During the Gulf War of 1990, commentators regularly reminded viewers that video materials coming from Iraq had been cleared by Iraqui censors. But we tend to be less sensitive to the biases of our own point of view; as an example of politically slanted language, the Manchester Guardian Weekly printed a list of words actually used in the English press to describe the activities of the two sides in the war in the Persian Gulf: