- Our not wanting to die is a bit of irrational behavior selected for by evolution. The universe doesn’t care if you’re there or not. The contrasting idea that you are the universe is mystical, not rational.
- The idea that you are alive “now” but will be dead “later” is irrational. Time is just a persistent illusion according to relativistic physics. You are alive and dead, period.
- A cyber-replica is not you. If one were made and stood next to you, you would still not consent to be shot.
- Ditto a meat replica
- If you believe the many worlds model of quantum physics is true (Eliezer does), then there already are a vitually infinite number of replicas of you already, so why bother making another one?
Terminal values and preferences are not rational or irrational. They simply are your preferences. I want a pizza. If I get a pizza, that won't make me consent to get shot. I still want a pizza. There are a virtually infinite number of me that DO have a pizza. I still want a pizza. The pizza from a certain point of view won't exist, and neither will I, by the time I get to eat some of it. I still want a pizza, damn it.
Of course, if you think all of that is irrational, then by all means don't order the pizza. More for me."
I'd have to know your father. Changing someone's mind generally requires knowing their mind.
Some theories that occur to me, which I would attempt to explore while talking to him about his views on life and death:
He's sufficiently afraid of dying that seriously entertaining hope of an alternative is emotionally stressful, and so he's highly motivated to avoid such hope. People do that a lot.
He's being contrarian.
He isn't treating "I should live forever" as an instance of "people should live forever," but rather as some kind of singular privilege, and it's invoking a kind of humility-signaling reflex... in much the same way that some people's reflexive reaction to being complimented is to deny the truth of it.
There's some kind of survivor's guilt going on.
If all of those turned out to be false, I'd come up with more theories to test. More importantly, I'd keep the conversation going until I actually understood his reasons.
Then I would consider his reasons, and think about whether they apply to me. I don't really endorse trying to change others' minds without being willing to change my own.
Having done all of that, if I still think he's mistaken, I'd try to express as clearly as I could my reasons for not being compelled by his argument.