Being a black cat mom x2 I've heard all sorts of odd things. Also being pagan I've heard all sorts of weird things about that as well. I adopted my kids in July and was told then that they were so happy they were being adopted because blackies (complete blackies w/not a stitch of white) are the hardest to place. I also know that the SFSPCA doesn't adopt out black cats around Halloween. My kids are strictly indoors, not only for ANY kitties safety but ESPECIALLY because they are black. Wicked people AND additionally hard to see at night (learned very well when Calvin escaped one night!) I just left a note on the door of a neighbor who allows her blackie out to please consider keeping Mr. Chip inside for the next few weeks especially at night. He's older and SO friendly that I fear for his safety especially around nasty kids/teens.
I also like the Wicca philosophy that what you do will return to you threefold. People who abuse animals are the worst excuses for humans there are.