As a cyclist, I'm in a very good position to assess how empty an intersection is: no windows isolating me in a sound bubble; low speed, so not much wind noise in my ears or tire noise on the ground; no A pillars obscuring my vision ahead; and my eyes are usually about as high off the ground as those of an SUV driver.
Motorists will tend to be in a worse position for assessing the emptiness of an intersection, and their vehicle is much more dangerous, so the onus to slow down is greater, but coming to a complete stop is often unnecessary. Slowing down to make sure there really is nothing there is sensible.
If I were on a recumbent bicycle, or in a little sports car, I'd have to be more cautious when approaching an intersection because my eyes are lower, and farther back from the front of the vehicle. (I hate riding recumbents in the city, but they're pretty awesome on long distance rides).
Also: your head is closer to the front of your vehicle and thus to the intersection.
You can assess the situation long before any part of you or your bicycle enters the intersection.
In many circumstances, drivers could easily defeat a failure to stop ticket in court based on lack of hard evidence that you were going over 15 mph.
Surely that should apply for cars then int his case. If the intersection is clearly deserted, cars should be able to clear the junction too.