Psychologists have been researching confirmation bias and possible ways to get rid of it for decades, and rightly so, as this cognitive defect has potentially dangerous consequences.
Thus, for example, if a doctor believes that his patient is a hypochondriac, he could examine him only superficially and thus hinder the early diagnosis of a disease that could even be fatal.
However, there is no reason to look for such dramatic examples: just think about the way we usually consume news, ignoring information that does not agree with our convictions, also due to confirmation bias. For this emotional reason, the algorithms of social networks show us only those data that fit our vision of the world, for example. In the same way, resentments between political groups are stoked and it becomes difficult to tone down radical opinions.
Science does not doubt the presence of this bias. However, there is debate regarding the role it plays in the decisions we make. Gary Klein, for example, claims that there are central flaws in the research on this topic so far.