Why such a process would have ever evolved in the first place and how it could have done so are questions for which the standard Darwinian model of evolution has no answer.
There is a bit of overlap in the two videos but not much:
Speaking for myself, the idea that such a process evolved seems possible, maybe even plausible, but the idea that such a process evolved unaided by any intelligent, purposeful guidance seems to me quite literally incredible.
Here's another thought for those who believe that our lives don't end when we die. Is it far-fetched to think that in this life we are like caterpillars and that death is really a kind of metamorphosis from which we emerge as a creature in some ways like, but in many ways completely different from, the caterpillar?