It's confirmation bias. When you want something to be true because it confirms your biases, most people are not going to actively try to refute it. This is one

It's confirmation bias. When you want something to be true because it confirms your biases, most people are not going to actively try to refute it. This is one big argument for avoiding ideological homogeneity in academia. Homogeneity reduces the quality of work since ideas that are not properly supported are less challenged than they would be in cases where ones idea goes against the biases of other researchers. Consider the replication crisis in psychology as another embodiment of this. This was all really started when a replication study attempted to replicate a number of impactful studies from top tier psychology journals. It turns out that 64% of all studies, including 74% of social psychology studies, could not be replicated. That means if somebody actually tried to replicate any given study, they'd more likely than not find it was dodgy. But nobody did this, because there was not much motivation to do it. Refuting others' studies hurts them, likely creates enemies for you, and doesn't do all that much for your own career. It's a messed up system that basically needs ideological heterogeneity to create that motivation needed to ensure good quality. But such heterogeneity is practically nonexistent in many soft sciences now a days, and to some degree the problem is even starting to seep into the hard sciences.