How is defending yourself from attackers wrong?

Who is defending who ?
So far both attackers have killed civilians in a completely reckless manner . So if both are wrong then which one is right ?
In case you don't get it , killing innocent people is wrong , killing innocent people and calling it defense isn't defense , it is just very very wrong .
Does that answer your question ?

In what way would a civil war justify an intervention by Syria?
Now that is a complicated one Husar , on many levels .
Previous interventions by Syria have been welcomed around the world ,something to do with stability , minority rights and defense of that very strange electoral system that Lebanon has .
It goes wrong when either they outstay their welcome , they decide to take sides or the people outside who wanted them in there in the first place decide to take sides themselves .(the middle-east don't yajust love it ) .
Then you have the whole pile of bull about territorial claims , you know , greater Syria , like all of Lebanon Syria Palestine/Isreal Jordan and most of Iraq .
Crazy stuff , but thats the mid-east for ya , nuke the whole place , its easier .