TEF is predicated on logic, a simple wager that every human faces:
If a reasoning human being loves and values life, they will want to live as long as possible-the desire to be immortal. Nevertheless, it's impossible to know if they're going to be immortal once they die. To do nothing doesn't help the odds of attaining immortality-since it seems evident that everyone will die someday and possibly cease to exist. To try to do something scientifically constructive towards ensuring immortality beforehand is the most logical conclusion.