Just because the policies are supposed to be neutral doesn't mean the resulting work is guaranteed to be truly neutral. Whether something is definitely a fact or an opinion can be very fluid, and you can play a lot with the amount of attention each viewpoint gets. Even a "neutral" article can end up reading completely differently when one viewpoint is very detailed and described in a fact-like way, while another only gets a short summary which reads as if it is a fringe opinion. And even when you are trying to be neutral, it is incredibly hard to avoid your output from getting shaped by the culture you are surrounded with.