Vultures Picking Rubber From Cars

Maybe it's a collective response toward humans for:
1. Invading their territory?
2. They are hinting for food?
(like throw me some frys and I won't screw up you car)
3. Something changed in their environment?
4. It's like Lassie trying to get the humans attention
to go save the kid in the woods?
5. Something in the rubber composite makes them think its food?
(like the "love bugs" think the road is a swamp)
6. They have aquired a taste for rubber because they have eaten
road kill for so many years? (it's a generational thing)