Most mainstream economists believe X, therefore, so should you?

Mankiw points out that roughly 4/5 of mainstream economists believe tariffs and like policies generally should be eliminated. He always makes a point to flaunt these statistics as if to say, "because most people believe this, so should you." But it's exactly this indoctrination by economists that I think is not only harmful for the profession in that is promotes group-think (or no-think), but it harms our whole society by painting things in black and white, as opposed to the more realistic shades of gray.