Your answer was good, but boy, the question, and other answers to it, show why I find most Objectivists repugnant. Even the one that got that doing things of societal value was ok went all evil at the end.
Here you can find answers to such burning questions as "Does a fetus initiate the use of physical force against its mother?" and "Is eating bread immoral?"It should give you pause that a philosophy, which roots itself in the notion of objective morality, projects itself this way to others.
What compels most people when they first encounter objectivism are its positive notions: the value of productive work, honesty and integrity; the idea that people are basically good and each has within him the ability to make great choices and become what he sets his mind to; the value of independent thought and never substituting another's judgment for one's own; the notion that life can and should be enjoyed and suffering is not essential.
It is only once these positive notions are well-understood and integrated, can one begin rejecting the things in our culture that contradict them. Let me go through an example.
Co-operation between member of society is crucial to its success. One of my favorite objectivist notions is that there is no conflict in interests of rational people. This means that it is likely in my best interest to donate blood as I understand the medical need for having blood banks. It is not in my best interest to give my blood to a stranger when donating blood will undermine my health (for some strange medical reason) and will undermine my ability to care for my children, pursue my productive goals and enjoy life. Few will disagree with either of these statements and understanding why one would choose to engage in a positive activity (donating blood and cooperating with others) is far more valuable than understanding a bizzarre edge-case of the other.
Finding the joy in life, the ability to pursue values despite obstacles and happiness attained in the process are the core values of objectivism that I implicitly teach to my children. Learning to find compromise when there is a conflict is one of the skills they will need to achieve happiness (which is ultimately the purpose of one's life.) Cooperating with classmates without hitting them over the head and finding value in the interaction will enable them to succeed in the classroom today and in the society as adults. At some point they will learn that some people believe they have the right to something that belongs to another and can use force to attain it. They will be able to combat this notion through the complete understanding of the value of cooperation and benevolence, of the rights innate to an individual, not because they are indoctrinated against self-sacrifice (a notion that's foreign to the child anyway!)
When we discuss our life philosophy, it is valuable to envision that you are standing on a street corner sharing your views with the passers by. Some are arriving, some are leaving. What they retain is bits and pieces of what you have said. What would you like for them to have heard come out of your mouth? "One should exert productive effort to achieve his values" or "... it is wrong to offer one a job on the basis of the need to feed his family..." (In case you are wondering: Yes, making such an offer would hurt the employer *and* the employee who will subsequently get fired from a job he was unqualified for, likely leaving in a worse shape than he arrived.)
And if you are awake at night, bothered with questions about whether a fetus is initiating physical force... There is nothing wrong with asking whatever question comes to mind in a forum - I don't hold it against you! However... have you focused on and understood the value of having children in all stages? Have you examined the motivations behind a mother getting pregnant? Have you determined whether either can be a rational choice? Is the fetus's action against its mother the only remaining unanswerable question you have? You will understand objectivism, philosophy generally and your own life far better if you focus on the things that are essential first - and the remainder might become self-evident faster than you might have thought.
In other words, focus on the positive values when you think about philosophy or advocate it. The "why it is wrong" questions will often answer themselves when you integrate the "why this is right, good and joyful" type.
(If you are curious, you will find the questions I have answered in my Objectivist Answers profile.)

