Grandmas lived long time and know things that stand the test of time. They know it is ridiculous to have a short term mind.
Bitcoiners have low time preference and it looks like bitcoin will live a long time. It is about "time preference".
"Virtue" might be just a definition of having low time preference and low space preference. Thinking about the future of humanity is being virtuous. Just like wishing well for others.
It all comes down to whether we think short term or long term.