A civil standard – balance of probabilities – is different. If a person trips and falls at a shopping centre, and they sue the shopping centre for negligence, then the case is between two legal persons. One person decides to sue the other. Even if one has more resources than the other, the law perceives them to be on equal footing.
In a civil dispute, each side has to build their case. Each side has to produce evidence. And the court has to decide which side is right. The plaintiff doesn’t have to prove their case beyond reasonable doubt, but it has to be more likely than not that their position is made out. But in this case, nobody’s liberty is at stake.