Are there "people/communitites who are right"? There are usually ones who are right about some things, wrong about other things.

Motivation to find contrarians can stem from two directions: to be less wrong even if a falsehood is temporarily considered proven; and to get a wider set of ideas when brainstorming.

Note that when brainstorming you benefit from completely unfeasible but relevant ideas. Wild ideas give new points of view and increase the range of feasible ideas you can think of.