First of all, your opinion is actually reflected in-game, only Night Elves seem to hold more restraint that you do.

Secondly, not all Elven Magi "BLEW UP THE FRICKIN'WORLD). Some of them did, not all. In all forms of socialogoy, it is considered inappropriate to judge all on the actions of the few. Lorewise, a) There were Night Elf magi assisting the the "alliance" of elves, tauren, earthen etc and b) They were highbourne whom rescued Tyrande from Zin'Azshari.

Now, sadly, there's almost nothing in-game lore to really push this Arcanaphobia. Most because there was no negative reaction from Tyrande and Malfurion when they met Kael'thas Sunstrider. A Mage who was identified as being of elven decent with the same surname as the one which freed her from Azshara.

From those actions, it's actually safer to assume that CURRENT night elven perception is significantly less hostile towards the Arcane than it used to be. However, IT'S NOT. The Highbourne rejoining Night Elven society is not going to be "Oh hey! How've ya been buddy? Haven't seen you since....". It will be sneers and contempt for a large part of it. Night Elven Mages will be looked down upon just like Orc Warlocks are.

BTW, just to reiterate. The highbourne that actually participated in the Sundering are now all Naga. The ones that helped, but saw the errors of their ways, are now High/Blood Elves, as too are the ones that fought against Azshara. The ones that are joining the Alliance, however, would've aided Azshara, but were never put into the position to.

Would you hate an entire family if only one of them did you wrong, even if they actually showed remorse and regret for the actions of that family member?