@Izzy78 - When it all comes down to it a beacon is simply a point of reference for people to use to safely land at their destination.
In terrible weather the simple things become hard to do and when you add travel into the equation it creates a potentially dangerous situation. By simply adding a flashing point of reference for boats or airplanes to use it tremendously helps in safely guiding people to their destinations.
I have heard instances of emergency landings being forced to happen and bon fires have been created to be used as a point of reference for planes to safely land. Simple acts such as this can go a long way in helping people reach their destination safely and preventing disasters from happening.