In his blog post “Why Might the Future Be Good,” Paul Christiano writes:
What natural selection selects for is patience. In a thousand years, given efficient natural selection, the most influential people will be those who today cared what happens in a thousand years. Preferences about what happens to me (at least for a narrow conception of personal identity) will eventually die off, dominated by preferences about what society looks like on the longest timescales.
(Please read all of “How Much Altruism Do We Expect?” for the full context.)