Compared to what? Los Angeles? Cairo?

Less sarcastically: I get your point, but it's a tradeoff. It's a beautifully car-free (and just plain beautiful and eminently livable) city otherwise. Yes, you do have to be careful about the bikes (as one must with cars, buses, and trucks, motorbikes and scooters just about anywhere else) -- but wherever you go, you pick your battles.