A forsaken paladin could exist should they have section of the Runescape Gold . Main reason being they are able to never function as member of forsaken in current existence brought about with Cata as basically Disney evil villains twirling mustaches since they plot evil. Pre-Cata forsaken cant be found as pure evil and even more a grey area which may of allowed paladins.
One cannot knowingly draw upon light for evil deeds when following belief based system of paladins. The strongest way of paladins where belief in light empowers them and stronger belief the stronger they become.
Belief just has to be cheap runescape accounts them thinking good as scarlets could use light. However might use a alternative method for example whatsoever the draenei method is or tauren sun worshipers or battery power like Blood Knights.
Granted the Blood Knight method like a lie as naaru could of just leveled entire city to escape like how naaru has been shown destroying a entire Iron Horde fleet.
In my opinion Blood Elves would find out the means of the druid even though with the power it offered and a different way to end addiction to arcane magic. You can’t tell me a blood elf would see the power Malfurion weilds without having to be jealous and sort of power.