Why are news reporters that way?

Who are these news reporters and anchors and why do they nearly all, in their reporting, support Democrat candidates and causes over Republican?

1. Many have journalism degrees and the motivation for that was to "Change the world".
2. Most like their jobs and want to keep them. You see, those who run the networks and news outlets are liberal and are very closely tied with local liberal politicians. Those who run news outlets also read/watch their product. The little people who do the reporting know this. There is no point risking their jobs by running a neutral report. The reporter knows that if they can slant the report and actually report it with a leftward slant then they will endear their management and keep their jobs.
3. The news reporters are generally ignorant of world history and US history. Their thinking is guided by the conventional wisdom. If you actually present them with facts or ideas outside the box then they get uncomfortable. Also take away their teleprompter or script and they will quickly be found out to know very little about anything except maybe what Tom and Katie have been doing lately.