I don't know is better

 I have experience with some situations, where people do more doubt on a person than anything else.

It would be better to say I don't know rather than a vigorous profile scrutiny!

People tend to have a natural inclination to doubt others more than they doubt other things or circumstances. This tendency can be attributed to several factors:

1. Complexity of Human Nature: Humans are complex beings with intricate thoughts, emotions, and motivations. Understanding another person's intentions and actions can be challenging because there are numerous variables at play. People's actions are influenced by their beliefs, values, experiences, and personal histories, which makes it difficult to predict their behavior accurately. Consequently, individuals may find it easier to doubt others' intentions or question their credibility.

2. Past Experiences: People's experiences with deception, betrayal, or disappointment can lead to a general sense of skepticism or wariness towards others. If someone has been hurt or let down in the past, they may develop a defensive mechanism of doubting others as a means of self-protection. This can manifest as a general lack of trust until proven otherwise.

3. Bias and Prejudice: Human beings are susceptible to cognitive biases and prejudices, which can affect their perceptions of others. Preconceived notions or stereotypes about certain groups or individuals can create a predisposition to doubt or mistrust them. These biases can be based on factors such as race, gender, socio-economic status, or even personal experiences.

4. Lack of Control: Doubting others can provide individuals with a sense of control over uncertain situations. When faced with ambiguity or unpredictability, people may resort to skepticism as a means of maintaining a sense of security. By doubting others, they feel more prepared for potential negative outcomes and can protect themselves from potential harm or disappointment.

5. Fear of Vulnerability: Trusting another person inherently involves vulnerability, as it requires individuals to open themselves up to the possibility of being hurt or betrayed. Doubt can serve as a defense mechanism to shield oneself from potential emotional harm. People may find it easier to doubt others rather than risk being vulnerable and potentially getting hurt.

It is important to note that while doubt is a natural human response, it is also crucial to strike a balance between healthy skepticism and giving others the benefit of the doubt. Building trust and maintaining positive relationships often require a certain level of faith in others, as well as open communication and understanding.