They didn't create a group of people who wanted unbalanced press coverage of events in line with their own viewpoints.

In British print media there is a whole range of right wing, middle and left wing newspapers. They all have a readership, and they all serve that readerships requirements. None of them created their readers thirst for leftist spin, or right wing shock - it exists and so they sell to it.

Often times the left and right wing extremes are owned by the same parent company. They don't care what we want, as long as we buy it from them.