That may be so, but being killed isn't the only thing that pedestrians are concerned with. At best it's plain annoying to have a someone on a bike squeezing aro

That may be so, but being killed isn't the only thing that pedestrians are concerned with. At best it's plain annoying to have a someone on a bike squeezing around pedestrians (remember that even a slow-moving bike is likely faster than people walking), and at worst there are collisions and bumps and forcing people off the path and whatever else. Cycling on a sidewalk is also not a good experience for the cyclist, either. When crossing a perpendicular street it's quite a pain to look behind to see if someone is about to turn into you as you cross the road. This is no problem for pedestrians because they move slowly and can usually look back without wavering too much. It's not a concern for cyclists on the road because they have the right of way. Then there are reversing cars, stuff in the way (bins, lamp posts, whatever) and myriad other reasons why cycling on a sidewalk is impractical. I love cycling and bikes and firmly believe cycling has an important role in getting people around. But it shouldn't be at the expense of people who're walking. Bikes belong on dedicated infrastructure or on the road. If the road is deemed "not suitable" somehow this needs to be addressed by building better roads.