You don't see the cyclists because they pass right by - they're only in a particular bike lane that you happen to be next to for a very short time, they don't usually need to stop, and yes, obviously there are fewer cyclists than drivers because cycling in the US is unsafe.
People don't bike here because they can't. I don't live in a city, I live in one of the many dense suburbs (which are denser than many cities in the US) of NJ, where there's lots of roads, and almost no bike lanes. Where biking does happen, they bike in the street, with no shoulder, and hope not to get hit by cars.
The bikes aren't stolen because there are no bikes, because you'd have to have a deathwish to try biking in the road with cars in the same lane as them.
It's the densest state in the union, and the only places you can bike are Newark, Hudson County, New Brunswick, Trenton, Atlantic City, Camden, the barrier islands, and the boardwalks. The other 99% of the state, you're putting your life on the line.
It's about safety. Would you feel safe biking in those lanes? Would you feel more or less safe biking where there are none?