Looks like Florida's stand your ground law works..
When I first started reading this, I thought it unusual that there wasn't a trial, but from my perspective, your home, car, boat and RV should all be extentions of your home and on a boat, where would you retreat to anyway.
Then I read this:
Mohlman's blood-alcohol level was at .23 when he died, nearly three times the level at which drivers are presumed legally impaired. Vittum's blood-alcohol level was .11 and the autopsy concluded he had cocaine, oxycodone and marijuana in his system when he was killed.
I'm guessing these were not reasonalble rational individuals.