grave robbery

On the phone Friday night, my Mom told me that she had bought special flower arrangements on Tuesday afternoon to put on my father's and grandparents' headstones for Easter week. My brother-in-law took them over Tuesday evening and placed them, securing them with fishing line to keep the wind from blowing them away.

The following morning Mom went over to the cemetery to find that the flowers from my dad's grave had been taken--the fishing line deliberately cut.

What kind of person steals flowers from off a headstone?