It usually isn’t the aim of war, though. When armies occupy territory the women there are at risk. Perhaps kidnapping isn’t unusual, though armies would probably struggle to carry women with them.
This was the purpose of the incursion. Not to claim territory but to terrorise, kill, maim, rape and carry off hostages.
That’s a bit more than the usual byproduct of war.
Again, I struggle to get past the fact that this was organised deliberate policy. Not a few men going rogue, not an expression of excessive testosterone or drug use- the purpose of the action. That is beyond words.