The official desrcription of the night elves is given here:
http://classic.battle.net/war3/nightelf/
Grom mentions the SENTINELS he meets fight savagely, he doesn't describe the entire night elf race as savage, nor does the lore or the game show them as savage. Especially when the manual has already defined them, and you don't see them fighting like very savage brutal beasts throughout the campaign.. lets get it in perspective sam.
They were dangerous, threatening in Wc3, when it came to fighting, but their lore, their history, their character both in that game and War of the ancients as well as classic did not show them as a "very savage" or "very brutal" race , not even close.
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I never saw the night elves fitting the orc/tauren or troll culture at all in WC3... I mean in WC3, Tauren being druids caused quite a stir, now people use that as some sort of indication night elves are closer to the horde.. especially since both troll races can be druids.
But they ignore all the night elves pre-sundering lore, forget the developments post WC3, and ignore the lore of the ngiht elves which is a high civilization race forced to live in a zero technology (in their situation - zero magic state) to fulfil their task. Then ignore this changes.. the night elves in classic return to civilziaiton, and while druids keep to the wilds, they are only part of the race, preists return to the city and the new temple, as do civilians start building villages, towns and cities, highborne return too..demon hunters too, and none of these fit the horde either. The druids weren't even horde feeling till post wow... when the horde were given druids, and by BFA had taken over the class, and the associations.