[They] are not afraid of death. Because [they] know that [their] memories are stored and will be transferred to a clone after [their] body dies. This is how [they] achieve immortality. What [they] are afraid of is that we might destroy [their] memories. Then [they] would be wiped out.
https://www.theverge.com/2016/9/29/13103982/facebook-arctic-data-center-sweden-photos