Cyclist here …
The problem is that so many cars want you OFF the road. If the choice is doing the proper legal thing (and getting honks and glares and cusses from drivers who don’t realize that it’s the proper legal thing) and doing something illegal that saves you the stress of the derision, many people will choose the latter.
There is one part of my route where if you are heading east and you want to go in any direction but south, you have to either
- make a 45 degree turn to the north, ride on a sidewalk (which is illegal) and then a path through a park (a park that is always filled with people; once when I was riding on that path I was hit by a ball that some kids were playing with), or
- do something that is perfectly legal and safe, but which makes drivers VERY nervous because it requires you to be where no cyclist normally is, and some drivers have to pass you at high speeds on the right.
There are no signs indicating any of this. It is up to the individual cyclist to realize that if they don’t want to be channeled south, they had better take some quick evasive action.
I always do the latter option, the legal one, because I am not bothered by drivers’ curses any more. I am one of the only ones.
I am not defending unsafe or stupid cyclists. I just want to note that sometimes, the legal thing to do is not at all the safest thing to do, and sometimes what appears to a driver to be the safest thing, may not be. The cyclist is at much greater risk and so they usually have a very good idea of their safest option. Frequently, the safest option is to get the hell away from the nearest automobiles.
For instance, in the previous example above, there is a light just west of that stupid intersection where I have to do something that scares drivers. I will often (safely) run that light so I can get to the stupid intersection FIRST, so they can see me there in a place they are not expecting me to be. This is much safer than proceeding through the green light when they do, and winding my way among them, coming up beside them, through their blind spots, etc.
Other examples are going the wrong way on small one-way streets to avoid dangerous intersections. Next time you are cussing at a cyclist for such things, ask yourself, would you rather be stuck behind them as they waited to make an unassisted left turn from the centre lane of a major street?
Re: th OP - I totally agree, riding on the sidewalk is wrong, and extremely dangerous. If you must be on the sidewalk on your bike, remember that YOU are trespassing on pedestrian turf, and the onus is on YOU to do everything you can to avoid hitting pedestrians. Also you are likely to get smushed by a car who doesn’t expect to see a cyclist on the sidewalk. So go at pedestrian speed. Or better still, walk your bike. Easier for everyone.