with the exception of the truly needy (as in: get this or die) stealing food or clothing, etc... I agree: all thieves should be hanged publicly and left for the crows.
Those who, in libertarian-speak, "initiate force" without justifying stimuli (imminent threat, for one... response to theft, for another) should die in a less speedy and humane manner.
There are no Robin Hoods. Only thieves.