Stealing from those who stole from you -- or, in the case of Robin Hood, others he claimed to "champion," -- is still theft. There is recourse against those offenses, certainly, but not by answering theft with theft.
I say that fully knowing that this is not a perfect world, and admitting that I would be one of the first to take up arms against those who would rob me.
And what would you suggest Robin Hood’s recourse be then?