The Ebon Blade was made to stop the horrors of Undeath be visited on others.Pretty much how I see DK's being used. If Paladins are Captain America, DK's are The Punisher. Granted I'd also personally see some DK's trying to take up their old lives and whether they succeed or not. WoW certainly could have some Friendly Neighborhood Vampires. Or in this case Death Knights.
I would love a Judge Dredd-esqe Death Knight character for the Alliance.
The shadow does not forgive, The Shadow does not forgive, The shadow does not show mercy.
Death Knights as a foil to Paladins can be just as a equal untiring weapon of justice.
I completely agree. I actually prefer the idea that DKs feel a little bit lost, it gives room to come up with your own story, For Ecrulis, after the Northrend campaign he almost immediately took up arms with the forsaken, seeing them more as kin than the Blood Elves, but more recently I had him accidentally reunite with his wife, a Paladin from Silvermoon, and she has made a mission out of trying to balance the darkness in him and point him in a direction that is predominantly good.
My point is I like that we this freedom to come up with almost anything in terms of DKs own personal story not everything has to be defined point by point by blizzard, this is an RPG after all.