Theme of wanted and unwanted children

I realized this morning there's a theme of wanted and unwanted children throughout Prometheus. Old Man Weyland thinks of David as the son he never had. And seems to treat Meredith as nothing but an employee. She doesn't even have his last name. David seems disillusioned by the idea that someone could be created only 'because they could'. Of course, the Engineer at the end of the movie sure doesn't want to become a parent at the hands (tentacles) of the Huggoth/Trilobite. Shaw can't have children, but when she finds out she's pregnant, she immediately wants to abort it. It's an abomination to her. Do the Engineers see Mankind the same way? "We created them and look what they've become so we must destroy them before they reach farther into the stars!" The Engineers want to destroy all of Mankind - that they supposedly created. Not so much genocide as infanticide. So then you have to wonder: was the creation of Mankind only an accident in the backseat of space on a drunken prom night? hehe