I have to agree on the warlock and shadowpriest part - along with the forsaken, blood elves were one of only two races where such dark arts were widely accepted, and not just tolerated or shunned. (An argument can be made for trolls and gnomes as well, but lorewise I consider them fundamentally different enough to be excluded from this)

Now blood elf society is moving away from the path that encouraged warlocks and shadowpriests, so these peopple are suddenly looked down on in a similar way orecruit warlocks are, in that their 'craft' almost cost their entire race their souls.

On my lock I see this the other way around - we were just starting to learn to take control of our own destiny when we decided to start depending on the whims of some so called higher power. It's like hoping for lightning to strike for some fire instead if learning to use available tools and resources like flint and tinder.

That actually raises a very good point. Culturally, at least for the past few years from the fall of Quel'Thalas at the hands of the Scourge to the reigniting of the Sunwell, blood elves have been all about control, manipulation, and the forging of their own destiny. When it comes to sources of power, they haven't been ones to simply serve it or bow to it like a shaman or druid or any of the Light-worshipping Alliance races, they've been more prone to taking and bending power to their own will (in a way, like the taunka's spin on shamanism). The Blood Knights didn't serve the Light, they made the Light serve them (or, at least, that's how they perceived it while M'uru played along).

By that line of logic, they don't approach fel magic in the same way that, say, the orcs did when they became victim to its corruption. The orcs surrendered to fel magic; they drank demon's blood and offered themselves to its power. The blood elves, however, would likely be more of a mind to force demons to submit to them. They would channel fel energy and then bend it to their purposes, much like they at least perceived themselves doing with the Light. Kael'thas surrendered to it and bowed to Kil'jaeden, yes, but the playable blood elves aren't those that followed Kael'thas. They're the ones that stayed behind and, again, forged their own destiny. By force.

Where am I going with this? Well, perhaps instead of being reviled by mainstream blood elven culture, their warlocks would instead be seen as almost heroic conquerors. While the rest of their society adapts to calling upon the Light instead of forcing it, that lingering thread of arrogant conquest within the blood elves would stay focused on demonic magic and making it work for them, leaving them much less prone to giving in to its corruption. Ultimately, that process could lead to something the warlock class still lacks: a living, protagonistic major lore figure to call our own, in much the same way that individuals like Darion Mograine, Tirion Fordring, Varian Wrynn/Garrosh Hellscream, Thrall, Hemet Nesingwary, Malfurion Stormrage, Garona Halforcen, Velen, and Rhonin Redhair are for their respective classes. The best we have for warlocks are orcish warlocks from the past who committed horrible evils...or more recently Wilfred Fizzlebang, and he's not much! The changing blood elf culture, coupled with their tendency to bully the powers they control, could do well to fill that "class leader" void.

The Thalasian Magistry of Information and Correct Perceptions would like to thank you for your contribution to this discussion, and for giving us the opportunity to discuss the Regent Lord’s policy on Warlocks and other users of fel and/or shadow magic.

On the subject of Priests of the Forgotten Shadow:

Silvermoon has always been a strongly intellectual nation, and as such, respects the freedom of its citizens to participate in any religion, provided that said religion is not determined to be “undesirable” by the Magistry of Silvermoon.
As such, it has been found that: “shadow priests,” while distasteful, provide no legitimate threat to the Magistry of Silvermoon nor to the Regent Lord, and are therefore free to exercise their faith, until such a time as this is deemed otherwise.

On the subject of Fel Magic and Warlocks:

First, the Grand Magister has, after many conclusive studies, adopted the position that fel magic may be both addictive and corrupting. It is officially suggested that any Blood Elf currently abusing fel magic cease immediately in favor of the harmonious, eternal, arcane magic of the Sunwell.
In accordance with his findings, the TMICP has begun a promotion to attach a “Grand Magister’s Warning” label to all fel crystals and demonic energy reserves by no later than the end of the century.

Second, the Grand Magister has also found that those Blood Elves who become so inundated with fel magic as to summon and command demons, do technically qualify as Warlocks. While no official ruling has yet been made by the Regent Lord on the legal status of warlocks, the TMICP would like to remind everyone that the Magistry of Silvermoon, is first and foremost, a council of mages. Although we are strictly independent of the Kirin Tor and therefore operate outside of Kirin Tor Prime Directive Alpha-1: “Destroy Warlocks—all of them—always.” it should be noted that:

The Magistry of Silvermoon does not look upon warlocks with favor.

While the Regent Lord has deemed raids of known warlock infestations to be “unnecessarily divisive,” the Grand Magister has requested that all warlocks residing in Silvermoon come to the Sunfury Spire for… registration… and cake…

Cordially,
Falthrien Dawnstar
Assistant Magister over Anti-Warlock Publications.