Riding on the sidewalk endangers pedestrians (especially children and people with disabilities). Crossing an intersection that has cars coming from the right is also unsafer because you enter drivers’ the field of view much later (than if you’re on the street) and at a higher velocity (than a pedestrian). If you are riding a car please accept that in the most places in the industrialized part of the world, bicyclists have exactly the same right to use the street (according to local regulations of course).