As a life long runner, let me also condemn the idiot cyclists who use the sidewalks.
As I tell my friends and family, if I fail to come home after a run, that means I’ve been run down by a bicycle, or, knocked into oncoming traffic by a bicycle.
They seem to think it is OK to ride half a block on the sidewalk if the restaurant they work for is in the middle of the block. They’re still coming up behind people or who are totally unaware of them, or coming straight toward people, no matter where on the block their destination is.
Cyclists do not use sidewalks. But, some people who bought bicycles do. Just like some people who run do it on sidewalks where people walk and push strollers, or on the wrong side of a busy roadway where they can be seen and admired for the grimace on their face.