That's a pretty "square headed" way to put it :) Ok, some do, some don't. The "has not properly considered the consequences" is a bad argument for anything. You can say that people shouldn't have developed the atom bomb or chemical or bio warfare agents because "they haven't properly considered the consequences". I for one am glad that the atom bomb and other "horrible things" have been invented, weird as this may seem. Your perspective on life and everything really changes when you stop thinking in terms of "right" or "wrong" or of there being a difference between them, and just think in terms of "going further, no matter where this takes you" - I think that even the darkest corners of whatever "hell" you imagine are worth exploring.
Just try thinking like this and see what you can see from this pov. - you'll never be the same again, trust me :) Death just limits the possibility of what one can explore and I believe all limits should be destroyed - but if you
want the limit, you can have it for yourself, nobody will force you to live forever. The argument would be that one
should have a choice of when it happens.
I like Nitzsche's take on immortality: "One has to pay dearly for immortality; one has to die several times while one is still alive." - I would actually love to be able to have this experience, no matter how terrible it seems to some (think about it: your self now is no longer your self from 20 years ago, this older self of you has, in a way, already died... If I'd live to be 1000 years old, an infinity of my older selfs would be already dead and maybe I won't really have any "real memory" of them anymore, except in an "archive" stored somewhere, that I could choose to "browse" if I ever wished to do so. In a way it would be like dying forever, but I would choose this over anything else, at least over "anything" that I've thought of so far.) ...I can't believe I've bothered to answer to this ...no back to work, back to trying to blow up some other "limits" :)