They are not one time events. This means that even if science allows for an infinite amount of time in an infinite number of parallel universes, evolution will not be able to overcome the poor odds. And we see that even if we believe that the building blocks are available, they do not spontaneously make proteins, at least not by chance. The origin of life by chance in the primeval soup is impossible in probability in the same way that a perpetual motion machine is impossible in probability. This web site will show that even 5 billion years cannot overcome these odds.
Life requires thousands of genes.
All of which have similar probabilities of evolving. Accepting a prior that these genes evolved, in spite of the poor odds, is not consistent with good science - a search for truth, knowledge and understanding. It is amazing that you can read calculations like my haemoglobin calculation, used as though they constituted arguments against Darwin's theory. This belief that Darwinian evolution is random is not merely false. It is the exact opposite of the truth.