This argument begs the question. To conclude embryonic stem cell research (ESCR) saves lives, one must prove that the preborn entity killed in the process is not a human. If preborn embryos destroyed by ESCR are human, then this process actively kills humans in order to benefit other humans. It would be akin to saying that if you are in need of a kidney transplant, you are justified in killing your neighbor so you can take his kidney. No matter the age of the person you are killing, this is still wrong. Note: In addition to the immorality of ESCR, it is interesting to note that it has been far less effective in actually treating medical conditions than adult stem cell research, which poses no threat to the individual from which the stem cells are taken and therefore crosses no ethical lines.