Diversity in mourning

Thanks to HBDchick for linking to this article about the various ways South American cultures deal with the death of a loved one.
One of the commenters, by the name of EMoom, wrote:

This ignorance of diversity in grief reactions becomes a legal problem when police assume that someone’s show of grief isn’t “normal” and therefore indicates the individual may have killed the deceased. Televised comments by police make it clear that they are confident in their ability to determine whether someone is showing real (i.e. “appropriate”) signs of grief at the death of a family member or friend, and that they base their determination of guilt on this assessment.
Crying too much or too little, dressing “inappropriately,” virtually any activity in the aftermath of a violent death (going out to eat, eating too much, drinking alcohol or abstaining, going about normal activities or staying isolated at home) can be interpreted as proof of guilt…

This is a very good point.  A lack of grief can, indeed, be a good clue to the guilt of a spouse or family member.  Law enforcement loses a valuable tool when cultural diversity renders it difficult, or impossible, to determine whether somebody is mourning.  This is just one more example of how cultural diversity can harm society.  I’m still waiting for a good argument in favor of such diversity.