It is self explanatory, A person who is a waste of life, the value of sperm is indeed wasted daily by hundreds of millions maybe even billions of people a day. It was better off that person in question with unmoral characteristics was not born at all, but rather swallowed by his/her mother.
Sperm is only half the battle. You can't compare a sperm to a full grown person. So can i fuck your mom in her ass?