the premise is that the person doing it is very mentally ill. the question, "why would they do that when they could do something else that makes more sense?", doesn't make a lot of sense itself under the premise.
If a person is very ill mentally then there are already many ways to kill people in numbers, some of which ways are much more accessible than slaughterbots.
the premise is that the person doing it is very mentally ill. the question, "why would they do that when they could do something else that makes more sense?", doesn't make a lot of sense itself under the premise.