In general if you're after the truth, I think you're much better off scrutinizing yourself for any type of bias or emotion, and doing your best to bracket it out. Evolution has unfortunately left us rather predisposed to believe what we want to believe, which makes sense when you consider the fact that the evolutionarily newer brain regions capable of reasoning and higher functions were simply placed on top of the older much more biased and present moment pleasure oriented regions, and these newer regions are often left subject to the whims of the older ones. We now for a fact that lots of un ideal forces are at play in the forming of our opinions, such as confirmation bias, motivated reasoning, and the halo effect. We also rather often aren't aware of why we believe what we believe, a belief that was formed from hard evidence feels the same as one that was formed from shoddy inference.

Though I am aware of some work in psychology that suggests that experts, making decisions in their fields, are sometimes better off going with their intuition. (I believe this may have been the work of eminent psychologist and nobel laureteate Daniel Kahneman)