When the search
for motives leads to moral alibis
By Lee Harris
In the wake of the
Boston Marathon bombing, Americans are again searching for motives. It is our
way of dealing with acts that shock and outrage our collective sensibilities.
We looked for motives after the Oklahoma City bombing and after 9/11. We looked
for them in the aftermath of the Newtown massacre, when we asked ourselves what
motive a young man could have to kill first graders. But what exactly are we
doing when we go in search of a motive for such crimes?
The concept of a
motive is an essential part of any criminal investigation. When detectives are
confronted with an unsolved crime, they begin by asking who might have had a
motive to commit the crime in question. For example, a woman is found dead
under suspicious circumstances. Only weeks before, her husband had taken out a
large insurance policy on her life. Here we have a possible motive for him to
kill his wife, namely, his desire to collect her life insurance. Needless to
say, a possible motive is not enough to convict the husband of his wife’s murder,
but it is enough to cause those investigating the case to focus more intensely
on the husband as a possible suspect.

















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