There are a few reasons why fondness can make us poor judges. First, when we like something, we are more likely to be emotionally invested in it. This can make it difficult to be objective and see things clearly. Second, when we like something, we are more likely to be biased in its favor. This means that we are more likely to see things in a way that supports our positive feelings about it. Third, when we like something, we are more likely to be influenced by our own personal experiences with it. This can make it difficult to separate our own personal feelings from our objective evaluation of something.
On the other hand, dislike can actually make us better judges. This is because when we dislike something, we are more likely to be objective and see things clearly. We are less likely to be emotionally invested in something we dislike, so we are less likely to be biased in its favor. We are also less likely to be influenced by our own personal experiences with something we dislike, so we are better able to separate our own personal feelings from our objective evaluation of it.
In conclusion, fondness can make us poor judges because it can cloud our judgment and make us less objective. Conversely, dislike can actually make us better judges because it can help us to be more objective and see things clearly.