The law, in short, allows people in Florida to defend themselves with force if they think they are threatened with bodily harm or possible death.
In a report last month, Mother Jones magazine detailed the rise of the Stand Your Ground law in Florida and explained how it had spread to many other states. Mother Jones is no fan of the National Rifle Association, so beware if you're a NRA supporter. Nevertheless, the magazine's reporting on the law does offer a strong explanation about how the law came to exist.
The magazine wrote, "Supporters of such laws cite the slippery-slope argument: Seemingly reasonable regulations—waiting periods, licenses, limits on assault weapons and high-capacity magazines—inevitably lead to ever-stricter measures, they argue, until citizens' constitutional right to defend themselves against government tyranny has vanished."
-- Phillip Tutor