A good home video recording system might be a good part of a self defense strategy.
In today's hyper-polarized world, it seems like "innocent until proven guilty" is out the window. Look at Travon Martin. Before the body was cold, people had judged Zimmerman innocent or guilty.
Having some evidence to back up your claim that you feared for your life might not be such a bad thing.
Had the townhouse behind which Z and Martin got into a fight been equipped with good quality surveillance, this would have never made it past the first hearing.