But the fact that the probability do indeed exist doesn't sit well with the local grads.

Put it this way, your existence's probability is even lower than that of 1-2%. You are the only successful Sperm that made it to the egg out of a million others at any one time. Take that multiply by the number of times your Father screwed your Mother before you made it to the Egg, the probability further lowered.

But the fact is, you exist now - isn't it?