> This is such an odd argument. No one kvetches over the meaning of "murder" because some are more brutal or premeditated than others.

This assertion is patently wrong. Discussions whether an homicide constitutes murder (1st degree or felony) or manslaughter (voluntary or not) are plentiful.

Isn't that the whole point of manslaughter? Killing people is (usually) a crime, but it's not always murder.