There are a few reasons why people might feel better off not knowing certain things:

Protecting themselves from emotional distress: Some information can be upsetting, disturbing, or even traumatic. For example, someone might avoid knowing the details of a terminal illness to protect themselves and their loved ones from emotional pain.

Maintaining a sense of control: Sometimes, knowing the inner workings of something can make it feel less predictable or controllable. For instance, people might avoid learning about the sausage-making process to avoid ruining their enjoyment of eating hot dogs.

Avoiding decision paralysis: Having too much information can make it hard to make a decision. People might choose ignorance to simplify a complex situation and avoid the stress of overthinking.

Preserving innocence or wonder: Not knowing everything can leave room for curiosity and a sense of wonder. This can be especially true for children, who might be shielded from certain information to protect their innocence.

Trusting others to handle it: In some cases, people might feel more comfortable letting others handle certain information, especially if it's technical or specialized knowledge. For instance, you might trust your mechanic to diagnose your car trouble without needing all the details yourself.

It's important to note that there's a balance to be struck. While ignorance can be bliss in some situations, knowledge is often empowering and can help us make better choices.