Why should there be bias in the media and why is an unbiased media bad?

I have to do this for a debate. I have to support the side there should be bias in the media. Any suggestions will be helpful because I got nothing.|||Bias tends to turn the news into propaganda and push someone's agenda. Real journalism presents the facts in a non-slanted way and lets the seer make up their own mind. Truth should be the standard for news in the media, and opinion shows should identify themsleves as such to viewers.