The point of diversity of opinion is that you have a challenge against the ideas of yourself and of others. If everybody around you agrees with what you say the

The point of diversity of opinion is that you have a challenge against the ideas of yourself and of others. If everybody around you agrees with what you say then you may never be thoughtful about your positions and can get away with being wrong. In academia a paper is written by a human who desperately wants to be right and publish it (because they are self interested of course) and the peer review process is there to challenge the methodology so that the truth can emerge. It's like if you had two sets of scientists who had opposing viewpoints but could only use objective measure to justify their own side, when placed in opposition to one another their biases will more likely produce a truth. It's also important to note that being able to analyze data and have knowledge of statistics is not enough. For a hypothetical example if you are a modern American progressive you might have a set of opinions which you identify with like a raised minimum wage, progressive tax, etc. You really want to be consistent in your beliefs so you seek out data which CAN justify your position. Like that minimum wage does not reduce employment or something. You search for any evidence that justifies it naturally and maybe do some shallow research on the opposition but deep down you know what side you are on. You have used data and statistics to justify your positions, but that is not enough to say whether you are actually right or not. On the other hand, the anti vaxxer which try to figure out if they MUST reject that vaccines cause autism and maybe they find one thing that says there is a reason to doubt and that is sufficient. In each case exposure to a formidable argument from the opposite side can really challenge their opinion. (Not that minimum wage is as simple as vaccines) If you have hard evidence against something like anti vaxers then you can do away with their argument scientifically, but if you characterize all conservatives/liberals in that way, they you are lacking exposure to real, formidable arguments against your own positions. Because there are certain issues where both sides have objective measure which justify their own side.