Children can be more open to new ideas and sharing feelings than some parents. This is due, primarily, to less intimidation and more trust in people than many adults.
The behavior of most adults is shaped by experiences. These experiences can be good and bad. For example if a person touches their hand to a stove top and gets burned, this experience leads them to avoid touching a stove top, without examining the risk, in the future. The same can be said for social situations. Many behaviors formed in childhood can last well into adulthood. An adult may have experienced ridicule or insults for sharing their ideas and feelings in the past. This can lead to not sharing this type of information later in life due to past experiences. Children, on the other hand, do not have as many experiences and will not have the same level of potential intimidation about sharing their feelings on topics.
The same equation can be applied to children and adults when it comes to trust. Adult behavior regarding trust is formed from past experience as well. If an adult trusts people over time, the number of total people increases. With that number of people, the chances of betrayal or having a trust broken also increases. These instances can build habits and behaviors in adults that have not been formed by young people.
Children can be more open, honest and trusting due to their lack of experience and negative outcomes in life. If these young people exercise some caution as they build their bank of experiences, they have the potential to experience more and learn more about themselves and others.