To witness a massacre in one’s dream suggests that the dreamer is a follower who will follow the ideas of others without question or hesitation.
Witnessing a massacre in your dream suggests that you are a follower rather than a leader.
A massacre is an indiscriminate killing and is of little spiritual value except to alert us to the violence of others’ belief.
In mundane terms, when business methods become both heartless and ruthless this can be translated into dreams as a massacre. This may also suggest that there is little we can do personally to prevent this. You might like to consult the entries for death and kill.
Indiscriminate killing in dreams suggests that emotions have been allowed to get out of control and taken over from reasonable behaviour.