https://wow.gamepedia.com/Sentinel_spies
Sentinel spies were sent to Quel'Thalas by the
night elves in order to spy on the activities of the blood elves and sabotage them.[1] They were aided by the dwarf Prospector Anvilward. Most of their activities took place in the Ghostlands, where they built a headquarter and camps, but also in the Eversong Woods.
That is not High elfs, Blood Elfs poss a threat to any living creature (LOL now they can transform life into magic THX KAEL).
Some time later
"OOOO this guys enslaved Naru, lets not spy on them ..... and be f@ked in future."
I would say same thing, if it were NIght elfs doing blood rituals for BLOOD MOON. (spy on them any time you wonna)
If some race doing bat-shit level crazzy things, you better spy on them ....... or they gona summon void lords,pokemons,bad youtubers.