That's a very long paragraph, I'm going to do my best but some things may have been lost in the wall of text.
I understand the difference between terminal and instrumental values, but your conclusion doesn't follow from this distinction. You can have multiple terminal values. If you terminally value both not-lying and also (to take a silly example) chocolate cake, you will lie to get a large amount of chocolate cake (where the value of "large" is defined somewhere in your utility function). Even if your only terminal value is not-lying, you might find yourself in an odd corner case where you can lie once and thereby avoid lying many times elsewhere. Or if you also value other people not lying, you could lie once to prevent many other people from lying.
a deontological obligation to maximize utility
AAAAAAAAAAAH
you should be prudent in achieving your deontological obligations
It is prudent to be prudent in achieving your deontological obligations. Putting "should" in that sentence flirts with equivocation.
won't your deontological commitments dictate which virtues you must have, for example honesty, or even courage, so as to act in line with your deontological obligations
I think it's possible to act completely morally acceptably according to my system while having whopping defects of character that would make any virtue ethicist blush. It might be unlikely, but it's not impossible.
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Does that even work? I'm thinking that an arrogant person will generally shrug off the mortality thing and go on with being arrogant, barring some near-death experience.
Or at least "this decade" rather than "some day". But death seems like a steep cost for this benefit. Is there another way to get it? Like, if we've got immortal people anyway, we're going to want to have a retirement equivalent, but it won't be a matter of working forty years and taking the rest of your life off. What if we had a system whereby people took ten years off work after every thirty or so, with a guaranteed salary during that time that's more than sufficient for living? Then you would have a specific timeframe in which you are expected to relax, take long vacations, knock off a life goal or two, that sort of thing.
That requires reworking social security / state pensions and probably requires a lot more wealth in general to enact. But we don't currently have a cure for death, so there's time to work out how to deal with a lack of death and enact those policies.
We are all arrogant to some degree or another, knowledge of or mortality helps keep it in check. What would the world look like with an unrestrained god complex?
Taking 10 years off after 30 years doesn't seem to solve the problem of the psychological issue, in today's world, as we get older we start noticing the weakness of our bodies which push us to act, since "if not now, when".
Unless we solve the various cognitive biases we suffer from, extreme longevity seems like a mixed blessing at best, and it seems to me that it would cause more problems than it solves.
I agree that these arguments don't decide the issue, but the counter argument of letting people choose doesn't seem to me effective. Also, arguments about how we would be superbeings who are totally rational, may be applicable to some post-human existence, but would not help the argument that longevity research should be pursued today (since, e.g. there would likely be wars over who gets to use it which might kill even more people, as we see in the world today the problem with world hunger and disease is not primarily one of lack of technological or economic ability but rather one of sociopolitical institutions)