Robbing is an unfortunate term to use for this activity as it implies that we need to rob the bees of their honey. The fact is the bees willingly allow their keeper to help themselves to this golden harvest whenever the honey is ready. Unfortunately there are unscrupulous, greedy  bee keepers who will take all the available honey and leave the bees to starve.  Those with a little heart might feed the bees sugar water which in turn weakens the bees constitution, as it does in humans, they then become susceptible to diseases.