Because sometimes I have to go to work in weather conditions like hailstorms, thunderstorms, or freezing rain.
He has a bunch of videos that address common complaints that people who've only known car-dependent lifestyles bring up.
Here's a good example of how to design functional bicycle infrastructure for a seemingly hostile climate: https://www.youtube.com/watch?v=Uhx-26GfCBU
Because sometimes I have to go to work in weather conditions like hailstorms, thunderstorms, or freezing rain.