This is like religious people who independently re-derive fallacious arguments for the existence of God (or the necessity to believe in him), and then present them to skeptics as if they were incontrovertible---things like the First Mover argument, the argument from design, or Pascal's Wager. Any agnostic/atheist worth his salt has heard every one of those arguments ad nauseam, and has definitive rebuttals to counter them.

And so it goes; your arguments are as old as cryonics. Here are the answers offered by the Alcor FAQ, in order:

- http://www.alcor.org/FAQs/faq01.html#evidence

- http://www.alcor.org/FAQs/faq05.html#met

- http://www.alcor.org/FAQs/faq07.html#overpopulation

To those interested in more detail, I recommend the Alcor FAQ (http://www.alcor.org/FAQs/), Chapter 9 of Engines of Creation (http://e-drexler.com/d/06/00/EOC/EOC_Chapter_9.html), and the World Transhumanist Association FAQ (http://www.transhumanism.org/resources/faq.html; search for the question "What is cryonics? Isn’t the probability of success too small?").

N.B. I am one of the signatories of the "Scientists' Open Letter on Cryonics" (http://www.imminst.org/cryonics_letter/) mentioned by Eliezer in the post.