When a suspect claims alibi by stating they were alone, which cognitive bias could they be displaying?

When a suspect claims an alibi by stating they were alone, they may be displaying the cognitive bias known as inconceivability. This bias occurs when individuals find it hard to believe that an event could happen or that a particular scenario is possible. In this context, the suspect may convince themselves and others that their being alone makes it inconceivable that they could have participated in the crime. This belief relies on their subjective understanding of events, potentially leading to a distorted perception of their involvement. By asserting they were alone and thus could not be guilty, they safeguard their self-perception and create a narrative that aligns with their understanding of the situation.