I don't think I would dare to introduce radically new stuf (I'm no scientist so it's easy for me to make this statement), at least in the area that puts food on the table, and this is what most people do. It's natural.
You need to be antisocial or obsessed or have no need to public suport due to a special situation(rich, political suport, personal inconditional suport from the boss, being an outsider).
Most of them will be wrong just the same and considered cranks, made fun off and forgotten.
We still need this kind of people even if we wont be like them.
The exactly same suggestion from "our friend" is treated differently then suggestion from "that suspicious dude/girl". It may be difference between mild criticism and "it is ultimate proof he is dumbo". It makes big difference in practical results. It may be difference between "jesus, did you had to say that" and "you are not gonna get responsible position ever again or at least you are not gonna go to that meeting again".