nomads sogh to assimilate human dna into thier own and did so effectively.. But in dnd rules if you are acting according to your nature its neutral (old ruleset) most animals were seen as neutral in alignment. But.. after having sat about and done the lore for so long weve got nomads of all alignments in there.
So.. as a race? nomads would definitely be in there as a neutral evil aberration of some kind im sure. hive minded species rarely get a good stamp in dnd.