Gravely Disturbing...

A recent widespread trend in America is disturbing me. I'm starting to see dozens, maybe even hundreds of these popping up. I do not understand the significance of adding a solar light post to a gravesite. What exactly is the purpose? I've tried to imagine the top ten possible reasons:

1. To keep the bodies from being scared of the dark
2. To keep the ghosts from tripping over the headstones
3. To help you find your loved one's grave when you visit at midnight
4. To keep evil spirits away
5. To keep good spirits away
6. To give birds a place to poop without landing on the granite
7. To be able to say "See the fourteenth light from the gate? That's Grandma!" to your kids
8. So yours won't look the same as all the rest (until everyone puts up a light)
9. So the vandals can see which family headstone they are painting or stealing
10. In case the rapture happens at night, so we can watch

Ok, so maybe none of these reasons are correct, perhaps it stems from an old indian ritual or something. But every time I drive by and another light has popped up, I think to myself, "Aren't graveyards supposed to be pitch black and spooky?" Otherwise, wouldn't they put up street lights along the little lanes? This one is in favor of leaving graveyards in the dark.