Its not? Are you implying that because you don't know something that its not common knowledge?
Let me help you out here.
Criminal suits require that you be found guilty beyond a reasonable doubt. Civil suits have a lower standard of proof, that is you just have to prove something based on a preponderance of the evidence. Just tip the scales in your favor. Hence OJ was found not guilty of murder yet still be held civilly responsible for the deaths.
Read a book sometime.