Is it more important to you that people of the future share your values, or that your values are actually fulfilled? Do you want to share your values, so that other (future?) people can make the world better, or are you going to roll up your sleeves and do it yourself? After all, if everyone relies on other people to get work done, nothing will happen. It's not Pareto efficient.

I think your deathism metaphor is flawed, but in your terms: Why do you assume "living for as long as I want" has a positive utility in my values system? It's not Pareto efficient to me: if everyone had the option of dying whenever they wanted, it would have consequences that I consider too negative in comparison to the benefits. (Bear in mind that this is a subjective assessment; even if I gave my reasoning you might still disagree, which is fine by me.)

Have the courage and rationality to admit that the loss is real, even if it's too great for mere human emotions to express.

I'm cowardly, irrational, and shallow, and I'm not afraid to admit it!