In a disputed right, competing claims may directly conflict. One person asserts ownership and the other denies it. If any unsupported individual assertion were treated as decisive proof, the adjudication of opposing claims would be unsafe.
The law accordingly safeguards disputed rights by requiring stronger proof. Both the adversarial setting and the binding effect of the eventual ruling separate this category from ordinary reporting.
This does not imply that every single witness is dishonorable or that an unproved claim must be false. It means that a court cannot enforce a right against another party without the evidence legally specified for that kind of claim.