I can still support a party or individual, but admit they have done something wrong. Likewise, I can oppose a party or individual, and find they have done no wrong in a particular instance.

While this is true that people can do this, the likelihood of it happening is very incredibly small. If something involves politics, the large, supermajority of people will reflect their bias regardless of if they agree to be impartial or not.

Its already difficult enough for people to be impartial when talking about various issues. But give them the ability to destroy a life of a person who thinks the way they hate? Not going to find anyone willing to be in that position that will not follow their own bias.