Why is dna fingerprinting more conclusive when proving a person’s innocence rather than their guilt?

Because if your DNA fingerprinting is not at the crime scene it means that you have no involvement in the crime, but if your DNA fingerprinting is at the crime scene, it does not necessarily mean that you are responsible for the crime.

Explanation:

Genetic fingerprint is the characteristic of DNA that allows differentiating each individual, related or not, from any sample that contains genetic material.

In addition to the use for paternity identification, the use of genetic fingerprint recognition is also widely used in forensic science. Currently what is a standard procedure, the collection of genetic material from crime scenes has, for over 20 years, been helping investigators to decide whether DNA samples from suspects and those found at the crime scene come from the same individual. However, a genetic fingerprint is more effective at proving someone's innocence than guilt. That's because if your genetic fingerprint is not found at the crime scene it means that you have no involvement in the crime, but if your genetic fingerprint is found at the crime scene, it doesn't mean you were responsible for the crime, but it does mean that you are a suspect.