A Civil Trial only requires a "Preponderance of Evidence" to win. In a Criminal Trial, the person has to be found "Guilty Beyond a Reasonable Doubt".
However, in a Civil Trial, what good will it do if Zimmerman loses? How are they going to collect from Zimmerman? What are they going to collect? His underwear? Winning a civil suit AND COLLECTING on a Civil Suit are two entirely different things, my friend.