She ordered hordes of her lightless hive to attack us on sight long before she spoke to us or we encountered her hive light bearer. We couldn't even kill the ghost immediately, we watched and observed it first before we killed it in self defense the second time we killed the knight. Savathun is not good, and some of the hive ghosts are practically psychopaths based on lore entries, she would've doomed all sol species to death, likely billions total, if she completed her ritual.