It COULD have happened a gazillion ways. Many ways it possibly could have happened. Therefore it did.

This is the same logical fallacy that the ID'ers are accused of--deus ex machina, except that the deus is evolution, not a deity. Evolution is an all purpose explanation for everything, except for abiogenesis, exempt from the burden of explaining as to how the whole process got started. By definition.

If all you have is a hammer, everything looks like a nail. Or as a friend is fond of saying, "When you go to a shoemaker, you get shoes."