Robin Hood is about stealing from the tax collector what was taken from serfs and giving it back to them. If anyone was rich, that was incidental to the story. He didn’t steal from King Richard, only his brother John.
Ahhh... but...
Stealing is stealing.
Thus the reference to the unsustainable financial strategy.
Let's substitute the word 'torture' for stealing. Is it ok to torture a person because he tortured others? (well maybe not the best example, but you get my drift.)