Situations vary. I was in a collision where a motorist left a stop sign early and we collided. LEO cited the driver for failing to yield ROW at a stop. So it isn't as if motorists are never cited. And certainly motorists are often not cited at automobile/automobile collisions when the LEO decides it was "just an accident."
Frankly I feel that any "accident" is really a collision where someone failed to follow the rules, and someone should be ticketed when ever a collision occurs.