In my experience, "independent thinkers" are always the ones most susceptible to manipulation, because they believe themselves smarter than everyone else, which makes them perfect targets for propaganda.
I think you're talking about the people that go against the mainstream ideas and authorities. It's very difficult to create an opinion about these people, because they might be right or they might be wrong or might be right/wrong 50% of the time. I cant really tell, and it changes all the time and also depends in which country/society you live.
All i can say is, questioning authorities is a good thing. As Einstein said: blind belief in authority is the greatest enemy of truth
We have a trillion dollar industry designed to manipulate peoples views. Nobody is smarter than that.