Even if humans lacked consciousness, they would still be doing the same things they are doing: Killing and eating other living things; breeding exponentially; murdering & stealing from each other; the only difference is they wouldn't be conscious of it.
Conversation
Yup & they wouldn't be all miserable about it either.
1
Replying to
They'd still be miserable but they wouldn't dwell on it because of a lack of self-consciousness; similar to animals