Mass murder being worse than a single murder seems self-evident. I don't want people who have done either to be roaming free in society. Granted a killing may b

Mass murder being worse than a single murder seems self-evident. I don't want people who have done either to be roaming free in society. Granted a killing may be a crime of rage or passion and not methodically planned, but generally that would be charged as manslaughter and so the difference in motivation and effect on society is already recognized.