George Zimmerman Had A Record Of Domestic Abuse

In the light of Trayvon Martin's murder at the hands of George Zimmerman, I am interested in the fact that Zimmerman was involved in a domestic abuse incident with his ex-fiancee in 2005. Zimmerman has a violent past, and seemed unstable from other comments and incidents. As part of his neighborhood watch program, he called police at least 46 times since January 1, 2011.

While activists and Martin's family are working hard to ensure Zimmerman is charged, I'm interested in starting a discussion about how we deal with cases of domestic abuse. 

Perhaps if Zimmerman had been more severely delt with after the domestic abuse incident, this murder would not have taken place. We need real solutions that strike at the root of the problem.

Weigh in: What is at the root of the problem of domestic abuse - causes, signs to look for etc? Are we currently dealing with these cases properly? I'm interested in hearing your thoughts!