That's a good point, but astute readers aren't likely to be misled by headlines alone. Unfortunately, headline scanning for confirmation bias of one's current

That's a good point, but astute readers aren't likely to be misled by headlines alone. Unfortunately, headline scanning for confirmation bias of one's current beliefs is rampant. This means (a) biased headlines will get more clicks, and (b) such headlines do constitute a certain lack of honesty in journalism, because of the likelihood that they will mislead many readers.