One counterpoint: biking on sidewalks is illegal in many jurisdictions for a pretty good reason.
If you're a pedestrian walking alongside a busy street, it's almost impossible to hear a cyclist coming up behind you, so unless the cyclist tells you that they're about to pass you, it's easy to unintentionally move into the cyclist's path and risk getting hit.
I've almost gotten hit several times by bikers on the sidewalk, and while such a collision would be much less injurious than a car crash, I can't say I'm opposed to such laws.
If you're a pedestrian walking alongside a busy street, it's almost impossible to hear a cyclist coming up behind you, so unless the cyclist tells you that they're about to pass you, it's easy to unintentionally move into the cyclist's path and risk getting hit.
I've almost gotten hit several times by bikers on the sidewalk, and while such a collision would be much less injurious than a car crash, I can't say I'm opposed to such laws.