26. The error connected by that if probability of some events is not computable, it is believed to be zero
Whereas the principle of precaution would demand that we attributed to such events 100 percentage probability. However it would lead to absurd conclusions in the spirit of: the probability of disembarkation of aliens is unknown tomorrow, therefore we should prepare for it how if it was equal to 100 percent. In this case it is possible to use indirect ways of an estimate of probability, for example, formula of Gott.