[lambda_obrien]

Would you want to fire several hundred kilos of tungsten in a random direction while you're next to the USA coast, where civilians and shipping pass by all the time?

Edit: as a reply, since I can't post faster:

CIWS, in certain modes, do indeed track a target and fire at it, which could be considered a "random direction" when considering the maneuverability of the target.

[tgflynn]

I would think CIWS systems don't fire in random directions. Anyway if these were just small drones that would probably be overkill, I would think a shotgun would be sufficient.