Cyclists crash into pedestrians at high speed all the time going down hills and going around corners.
In my mind it is a perfectly fair bit of judo to firmly grab the handlebars and dismount them forcibly if they are endangering the public this way.
These days, I almost always ride on the street but sometimes will cut over to the sidewalk in the case of a one lane bridge, dangerous intersection or a traffic jam. I always stop for red lights and usually wait for them to go green. In the case of rush hour traffic, there are certain intersections that are particularly dangerous. At these intersections, I often get cut off drivers who pass in the intersection and turn in front of me.
I've learned that stopping for the light and proceeding through mitigates these circumstances.
Cyclists imagine they get killed because somebody comes up behind them and runs them over either out of ignorance, hate or both.
That really happens in Georgia, Florida and places like that but in civilized places cyclists really get killed at intersections and when they transition from being invisible to being visible.
Bike paths were built in San Luis Obispo, CA and got a reputation for being astonishingly dangerous because from the viewpoint of cars bicyclists would "come out of nowhere" and they couldn't brake in time to stop them. Oppose that to a bicycle that is operated like a vehicle and is visible and predictable like all the other people.
The first thing many people note about the Netherlands is that they have separated bike lanes, but the most remarkably thing is that all of the intersections are designed with many different transportation modes in mind. Separate paths that connect randomly to the roads are dangerous, but separate paths that form a meaningful composition with the roads are priceless.