What I mean is that if you are consuming news media and seeing only one point of view, something is wrong. I feel like I frequently see commenters who implicitly believe there's only one valid side to an issue, and the other side is just racism / bigotry / corruption.

True, that's a call for diversity. But if you're seeing multiple perspectives butting heads consistently across the news media consumed by an entire country, that's divisive, as a result of having diverse perspectives and coverage. To your point, though, that's likely more the result of a lack of diversity at individual sources and people picking and choosing to consume less diverse news. "Divisive" isn't the right word.