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Where I'm riding it is completely legal to bike on the sidewalk, so it's not something that should be unexpected.

> I consider pedestrians to have just the responsibility of paying attention to their surroundings

This is what I'm talking about. Many people cannot even be bothered to do that. If you aren't going to take an interest in your own safety, why should anyone else? The sidewalk is not the place to zone out and lose yourself in your Twitter feed.