Violence is only justifiable if it is to prevent harm to an innocent party. As cog dis points out, it shouldn't be a vauge feeling you might be at risk, but either a response to an actual physical assault or a proactive attack to pre-empt an attack that any reasonable person (i.e. a jury) would assume was unavoidable.
If a woman is being abused by a violent husband is she 'justified' to physically cause him violence to stop it?
Yes. Even if it is pro-active. A woman who has provably been physically abused for some time by a man and who professionals agree was in fear of her life but trapped in the abusive relationship and incapable of leaving should not go to jail for killing him in his sleep.
If a child grows up and later meets his sexual abuser is he justified in causing the abuser physical harm?
No.
I was reading at the weekend in a national newspaper about the systematic mass violent rape that is taking place in one of the central African countries. There were reported cases of husbands being forced to watch their wives and daughters being gangraped with wooden objects to the extent that the womens internal organs are now totally ruined..
If that husband managed to break free would he be justified in causing physical harm to those abusers?
I'd kill them if I got free, and think it quite reasonable to do so.
I see it this way; every one has a right to life and to not be physically attacked. Anyone attacking another voids their right to not be attacked, anyone trying to kill voids their right not to be killed, and if there is a grey area (is the guy just attacking me is he trying to kill me?) I am not going to stop defending myself until he is incapacitated or dead.
(hit send to soon)