Unusual as in there is no other Dalish in all the other clans that has shared that life span of hundreds of years? Kind of odd given their culture of wanting to reclaim that lost immortality. Either the Dalish are stupid beyond belief or they are taught to never question a Keeper. A good Fascist philosophy.
And no in either cases of DA:O or DA2 you are not a murder. You are stuck defending yourself after helping to clean up their keepers mess. In neither case you do not seek out with the goal to kill these clans for personal gain.
And stop shifting blame Zathrian did the curse he is responsible for the harm it caused.
In my opinion,Zathrian is the only one clearly responsible for the werewolf curse and therefore the attack,the game makes it obvious.
However,this thread is speculation about the potential background of the Dalish pc in Inquisition.
Not about how certain Dalish clans or the pc,handled certain situations,in the previous games.
Not to be rude,but this subject has been discussed countless times before ,as interesting as it is though,it has nothing to do with the OP.