Defending yourself shouldn't be penalized. Someone defending their property, defending their animals or defending their family, allies or their person should NEVER result in an alignment hit. This is common sense.
I can already imagine the trolls starting alts. The troll locates their targeted individual, logs on their alt and then attacks their foe, trying to get their targeted foe to defend themselves just so the person defending themselves takes an alignment hit. Obviously one player is intending evil and the other is only intending on preserving their well being. The person trying to preserving their well being should never be penalized. That's wrong on multiple levels.
It's socially accepted in any genre or in any era that someone defending themselves or defending their property against physical harm is morally just and on the side off "
"good" or "right" where as the aggressor is in the wrong. This needs to be properly reflected in game.