ELI5: Explain Like I'm 5

In pari delicto

In pari delicto means that two people or groups of people both did something wrong and so neither of them can take any legal action against the other. It is kind of like a tie - nobody wins and nobody loses. For example, if two people have a fight and both of them hit each other, in pari delicto would mean that neither of them can sue the other because they both acted wrong.