Perhaps a journalist should decide to either report news factually without the bias, or offer commentary with the bias.  He/she creates the slimy environment when trying to do both.   Distinctions are then blurred when the firewalls are no longer there.

Once a journalist goes down the path of the latter, there's no going back.  He/she is marked as biased accordingly.  I think this is the situation most media outlets find themselves in.  Unfortunate, but they gleefully  stepped in it.