if I read the story right...
person trespassed onto homeowner's property with illegal drug device
person was asked to leave and he did leave.
person left his illegal drug device.
person came back angry wanting his illegal drug device
person was told to leave and chose to confront the homeowner.
The homeowner feared the drug user as he came towards him so the homeowner protected himself.
Can't criticize him.
Well, except for those who say they would have stayed inside and called police.
That was an option but I think the homeonwner was consistent and
the trespassing drug user is the aggressor here.