So, tomorrow, everyone wakes up to find the world filled with, um, skysharks. These skysharks attack people with reasonable regularity but can be killed, though their population can't be drastically reduced. In other words, they are here to stay.
How do people react to them?
I believe that for one thing, the skysharks will become a key political factor. Any administration which doesn't appear to be dealing with the problem will be destroyed at the elections.
Another reaction would be religious interpretation. Some will say they are a punishment from God, some will say a punishment from nature, some will worship them in the way some worship demons.
Go.