What the hell are you talking about. Bicycle lanes are much more common than sidewalks. Pretty much any road outside of cities/towns won't have sidewalks but will have bicycle lanes.
Not true, at all. There is a distinct lack of bicycle lanes where I live (and the surrounding counties are guilty of it as well), but then a lot of the roads have sidewalks. You aren't really supposed to ride bikes on the sidewalk, but they are really wide sidewalks and cops will never say anything about it.
But still, we are talking about Small Town, Oregon, with a population of ~30k. And I did a bit of looking around and found where the school is located and what looks like a busy road.
And look: No side walks or bike lanes
Different road that also looks like it could be busy, sidewalks but no bike lane
And even, right in front of the school, sidewalk but no bike lane.
How about right in Miami-Dade Florida?
Again, Sidewalk but no bike lane
Look at that, Big City, USA, sidewalk with no bike lane
And lets look at NYC even, one road has a sidewalk and a bike lane and then the side street doesn't have a bike lane.
Or how about somewhere more rural.
So you are absolutely, 100% delusional, if you think that bike lanes are ubiquitous. If anything, sidewalks are more common just from my poking around, but that doesn't make either common to all roads.