Utilitarianism expands the moral circle to include people outside the group, even strangers.  For utilitarians, the good is, variously, pleasure, the satisfaction of all individuals' interests, or happiness, and utilitarians hold that a person ought to do what will maximize the overall best consequences for everyone.  The theory requires that one consider equally the like interests of all individuals affected by one's actions and act not to maximize my own happiness but rather the happiness of all.  Its practical advice is this:  Always give equal weight to the like interests of all individuals affected by our actions, acting to maximize the balance of good consequences over bad.