1. Evolution has no discernable goal.

2. Evolution does not act to increase lifespan, in general. Evolution is about living long enough to reproduce. This is why evolution can actually produce things that will kill a species. Sickle cell may kill you, but in a place where you're likely to die early of malaria, it provides you the chance to live at least long enough to breed.

3. There is scientific knowledge and there are other kinds of knowledge. Saying that something is not scientific is not the same as saying that it's not true or that it's not useful.

4. Evolution, indeed science itself, does not guarantee survival for us or any other species. If anything, this is a lesson that we need to be careful and pay attention.