All people hold bias in their minds. Confirmation bias. Belief bias. The background of a person will affect how they report the news and there is no way around it.
For myself, part of what I have to deal with comes from my political beliefs. Being liberal means that I am more likely to want to report on things that confirm what I believe.
The same can be said for being atheist, being white, being a man, being raised upper middle class, and being American.
All of these can contribute to what I am willing to believe, what I want to report on, and, unfortunately, how I report it as well.
Being aware of the bias can help. Always making sure that I hear both sides of the story and listen to all arguments surrounding it can at least make my reporting fair. Removing myself from the story helps as well, so that only the facts are reported.
Lastly, being up front about my own beliefs and biases can help any potential readers determine for themselves whether or not what I say is trustworthy.