Naked political power. Plain and simple. My Baby Boomer generation went into the press to be advocates for their worldview, not to report. They're now in the controlling positions of most news organizations and are so convinced of the veracity of their beliefs that it isn't even overt bias anymore. Liberalism simply exudes from their pores. Many have probably never had their views challenged in any serious way. At this point it's just part of the cultural landscape and probably won't change until we start to die off.