Psychological splitting might seem to be an unhealthy way of thinking, but it is a necessary mental process. It allows us to make sense of the world. As we progress through life, we are bombarded with a huge amount of information and experiences. In order to understand all of this, we need to group all of this information into categories. As we experience more and more, we begin to split all this knowledge into meaningful groups. These groups then help us understand unfamiliar events.
So clearly, we all use psychological splitting at some point, but when does it become unhealthy? Psychological splitting starts to be problematic when a person fails to bring together their opposing views.
Splitting occurs when the only views someone accepts are extreme ones. A person that exclusively focuses on the positive or negative, or one that cannot bring together their opposing views is likely to split off.