"Robin Hood stole from the rich and gave to the poor." That's the usual line, and it's misleading. Robin Hood didn't "steal from the rich". He attacked the king's tax collectors, taking money back...
Robin would have been stealing the tithe money that the rich land holders would have been paying to the county administrator. Back then, counties were called "shires" and the Conservator of the Peace...
In my novel The Robin Hood Chronicles Robin give he answer I believe any robber would give: he steals from the rich because they're the only people who have money. He'd be wasting his time to steal...