It is in no way scientific based. It is more an expression of different thoughts connected to the discussion of biodiversity. The scenery is, therefore, not the big conference room with fancy AV equipment and a big alert audience. You should image deep armchairs and dense, low-hanging cigar smoke. To balance over time, any population will turn over with the rate of reproduction being the same as the mortality rate.
Death is, therefore, just as frequent and 'natural' as birth.
Without death no room for birth. As a consequence of our human civilisation and cultural development man has come to the general observation, that birth is good and death is bad. We feel that deeply in ourselves, and the closer the relationship - own children, family, friends etc. Of the same reason huge amounts of resources are spent to find new methods to make human life longer - to postpone death. This is said in no odious meaning.