Consensus is a method where you can get a result that is far more accurate than any single scientist.  Think about how a bee hive will locate nectar.  The bees all roam out, come back to the hive and communicate to each other.  Then a consensus is created.  This consensus is better, more accurate than anything any individual bee could figure out.  There is also phenomenon that looks like it is consensus but it is not.  For instance, when moths all dive into the flame of a campfire, it looks like there is a consensus of moths deciding they want to be incinerated.  But this is not a social insect and not a consensus.  What is really happening here is that moths guide themselves by the light of the moon at night.   The moon is so far away that they can always keep it on their left (or their right) and fly straight ahead.  But notice what happens if they keep the light of a fire on their right, thinking it is moonlight.  Their flight spirals right into the fire.  But it is not a consensus that creates this massing of moths to the flame, it is instead a shared but mistaken response to a stimulus.

I think we all know what the analogy I have built here represents.  Who is on the side of scientific consensus.  And who is the moth responding to a stimulus.

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