Because its portrayed as actual fact when there's no concrete evidence to support it as being that cut and dry. Charts and posters are great illustration devices, but they don't tell the whole story. I went through this before, the figures, the data, the outcome, back three decades ago. Who are the persons releasing this information, what agenda do they have, what's their background? In today's political reality these are legitimate questions. Who's funding this research? Does the funder have an agenda, sounds cynical but even the climate has been politicized.