As far as neutrality is concerned, I'd like to see someone argue that a graph of sin(x) with x between 0 and 2pi and y between say -1.5 and +1.5 is not neutral, provided it is presented as a graphical approximation of the function and domain.
For other numerical graphs, such as stock prices, or population development, there's always the possibility that it isn't represented in sufficient detail, but that would depend on the user's knowledge and expectation, I think. How to lie with statistics is a good starting point for that. The article suggests the same idea, but makes it a social issue.