Why do some people think saving is bad anyway? What is meant by wealth distribution in practical terms and why should people go along with it?

Greed is basic human nature and is the driver behind bitcoin. Without a possibility of turning a profit nobody would invest meaningful money into it. Greed is, in other words, good, or at the very least necessary.

What makes bitcoin unsustainable? The fact that it will some day stop rising in value? But that is exactly what others say is necessary to make it a useful currency. Is it simply envy at work or is there something being left out of the discussion?