Judgment, as a natural human inclination, serves multiple purposes. It can indeed act as a protective mechanism, helping individuals navigate complex social landscapes and avoid potential threats. This propensity to judge enables people to read patterns in behavior, allowing them to evaluate character and intentions based on past experiences. However, the reliability of such judgments is often a subject of debate.

The assertion that "it takes one to know one" emphasizes the subjective nature of judgment. Individuals are inclined to perceive traits in others that resonate with their own experiences, creating a bias influenced by their personal histories. This can lead to a degree of confidence in their assessments, as familiarity with certain behaviors fosters a sense of understanding.

Conversely, once a judgment is formed, particularly a negative one, it can be challenging to alter. The evidence required to shift a perspective varies greatly among individuals, often influenced by the depth of their initial impressions. For those with a positive view, defending a character can appear instinctive, fortified by their experiences. Meanwhile, changing the perceptions of those with a negative view may prove to be an arduous task, as their established narrative shapes how they interpret new information.

Ultimately, the decision to adjust judgments rests solely with the individual. This underscores the complexity of human interactions, where the interplay of evidence and preconceived notions shapes our understanding of one another. In navigating these judgments, recognizing their fluidity and the factors influencing them can foster more nuanced perspectives.