It would certainly not OK unless you also painlessly kill my wife, family and friends. Of course I would still be afraid of it because we have the irrational existence bias built in. I'm not particularly upset about the fact that I didn't exist 100 years ago so why should I be upset about not existing 100 years from now as long as no suffering is involved. Of course knowing that our existence is about to end causes as agony due to our biases. That doesn't mean though that we as a rational society should allow these biased to set or goals. We need to take them into account though.