For the Benefit of Mr Kite

1. They don't actually do a good job. The only time an umbrella actually protects you from getting wet is when it's sprinkling. However, when it's sprinkling you generally don't need an umbrella unless of course you're the Wicked Witch of The West who melts when you get wet.
2. Short people who use them in the City. Only very tall people should be allowed to use umbrellas so that they don't poke other people in the eye/head/chest (if you're really short). Short people with golf umbrellas is the worst. In my opinion there is little reason to use an umbrella in the city no matter how tall you are as there are lots of awnings and the only time you're going to get wet is crossing the road.

As you can probably tell it was raining today whilst I was walking to work...