I've always felt, based on my internal experience, that the things I believe I have little to no control over. I'm just persuaded by the evidence or argument, or I'm too emotional/blind that I just don't see why I'm wrong. I can imagine motivated reasoning blinding me, but I truly can't really imagine what it would be like to actually consciously think something is mostly false, and then make an effort to try to get myself to believe it. It just seems like it wouldn't work. Maybe you are using the word "think" differently than I am? Can you maybe tell me about a time you did that? You say it wouldn't help but it might.