Florida Stand Your Ground Law is worth reading.
If you are at a gas station and see a pack of wild youths attacking someone... You can kill them all in defense of the victim.
Property? You can blow someone away to protect your property
It takes Castle Doctrine to a much higher level. No matter where you are... it is now your castle. Your car, your perimeter, your friend's house, etc etc.
Long story short. Left wing whackos go bat shit over the Stand Your Ground laws as it truly turns the tables and turns the aggressors into the victims. Additionally, it purposely wipes out civil cases... If you blow someone away and it is a justified killing... you can't be sued by the family.