• "Selfish" vanity, fear, etc. including accumulation of wealth, power, etc.
• A desire to remain with loved ones, including pets, and to keep loved ones around, including celebrities.
• A safeguard against unexpected "unfair" death, e.g. getting murdered, assassinated or dying in a freak accident, or terrorist attack etc.
• Carrying out long-term plans that take longer than human lifespans.
• Participating in projects that take longer than human lifespans and may not be easily restocked with new humans: e.g. traveling interstellar distances in confined spaceships.
- The aforementioned "plans" and "projects" may simply mean the preservation and protection of certain things, ideas, cultures, rituals and records that cannot be automated or archived.
• A desire to explore more of the universe than can be done in a mortal lifespan.
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And the following possible ways where one or more of the above goals may be achieved:
• Cloning. You basically get a new person that may or may not be "as good" as the loved person/pet/celebrity you wanted to preserve.
• Mind/Memory archival/copying.
• Repairing/Rejuvenating one body for as long as you can.
• Separating the brain from the body and having it remotely control multiple "backup" bodies.
• Reincarnation. This of course assumes a "higher" plane of existence where our "true selves" actually live; e.g. this reality being a VR MMO that you can only play for as long as you paid for.