Unfortunately, I see it all the time. Squids riding bikes they can't control. Some are just plain lucky and haven't killed themselves yet. But most of the time, I've had my weekend rides tainted by idiots, sitting on the side of the road waiting for an ambulance while trying to keep the rider alive, or keep his leg or other limbs intact. Its these fools that make the real bikers look like organ donors. I see them come and go ... I really don't want to give a shit anymore ... but you never get used to it.
I see the same idiots out on track too. You try to give them helpful advice and they just end up breaking a perfectly good bike. The racers are at the track for your benefit too. Don't be afraid to ask them, and try not to be a hero! Take everything we have to say on board and take it easy with your speed, breaking markers, lines, body position and throttle control out of turns!