Adults do not possess the innocence of children because as people grow older, they become more aware of the complexities and harsh realities of the world. Children, on the other hand, are often naive and unaffected by the negative aspects of life. They have a pure and untainted view of the world, free from the cynicism and skepticism that adults develop over time. This innocence allows children to approach the world with wonder, curiosity, and a lack of prejudice, which adults often struggle to maintain.