Saying that the USA should get out of Vietnam is an opinion. You do not have to explicitly mention a party to express a partisan position. “Real” journalism reports the facts of what’s going on and lets people make their own decisions. They can interview people and report the opinions that other people hold, but they should try to avoid inserting their own biases. Walter Cronkite leveraged his position to express his personal opinion to the nation- that’s political.

You don’t have to give time to things that are objectively untrue, but a fair journalist should acknowledge when other opinions exist.

Saying, “I think we should get out of Vietnam. People are dying, we’re spending too much money, and we’re probably going to lose” is bad journalism. Saying, “According to a recent poll, fewer than 40% of Americans support the war in Vietnam. Commonly cited reasons for the lack of support are the death toll, the economic cost, and that there doesn’t seem to be an end in sight. Most supporters of the war say we should continue fighting otherwise all the soldiers that have given their lives will have died in vain” is good journalism.

And yes, a journalist covering the creationism vs. evolution debate should research and interview people from both sides. If you don’t then you’re writing an opinion piece and not doing journalism.