Why do people on the left think American media is right wing? Because journalists are paid by corporations funded by other corporations? Why do people on the left think journalism is right wing? Because journalists go into the field to make a difference rather than to talk about news or events or science, and when people want to be important, they become activists.
And controlling media works.
While many groups find media bias to be a negative, social psychologists say it can be a benefit; by getting them to produce positive content or conciliatory messages about ethnic groups and genders.