Misinformation is not defined by the knowledge of the one who spreads it (like if the spreader knows that it is wrong), it is therefore a useful word to use in journalism, since, if you would say it is lie or disinformation, you would have to be able to prove that or the victim of your text can sue you for misusing your credibility to spread misinformation (yea, funny irony here) and force you to take the story down.