I don't think you have a grasp on risk. It is measured by calculations. The calculations that take into consideration the probabilities of alternative events just for two particles colliding and giving off photons takes a post grad one full semester to do. The number of blackboards would extend several football fields. For one collision between two gold ions at Brookhaven the same post doc would need a few years. So they need supercomputers that can do 64 trillion calculations per second (by 1990 standards) to predict the probabilities.

Strangelets are very rare occurances and are likely inside of neutron stars. The probability there is greater. Look at all of the billions of neutrinos going right through your body right now. Billions per cubic centimeter. If just one thousand of them collided with your nuclei you would be killed. The chances of getting hit by neutrinos is greater than suffering some miscalculated risk of HR.