And what would you suggest Robin Hood’s recourse be then?
Spoils of war are not contravened by religious law.
Go Galt. The Big Bad Sheriff of Nottingham can't take from the peasants what they don't have. And it doesn't avail the king much to starve the peasants to death; all he ends up with then is a disposal problem and nobody to rule.
The peasants outnumber the king's soldiers, and the king has to feed, equip, and shelter them -- at great cost to his treasury.
Or stand together and fight. Ambush the king's columns as they march on the villages. Infiltrate his court and poison a few of his advisers. Drag the sheriff out of his manor and hang him from a tree. But don't delude yourself by thinking that stealing from the thieves makes you anything but a thief yourself.