Well, first off, the fact that you are comparing a collection of cells to that of a baby and holocaust victims is one problem. I find this line of argument hopelessly short-sighted and blinded by religious dogmatism.
These are the facts. Stem cells are harvested from a collection of 150 cells called a blastocyst (for the sake of comparison, there on 100,000 cells in the brain of a fly). These cells have no brains, neurons, feelings, life functions, or even conciousness. There is no reason whatsoever to believe they suffer their destruction in any way. The argument that they represent a potential life is lacking to. With the advances we have in science any cell in the human body with a nucleus and DNA can be a potential life. Everytime you pick your noes you are creating a holocaust of potential lives. This also should beg the question if almost half of all conceptions end in miscarriage (with or without the mother ever knowing), then God has been the biggest killer of blastocysts since time began.
On the otherhand, it is beyond dispute that babies and holocaust victims could feel pain, have life functions, and hae conciousness. Furthermore, there are an inumerable amount of people suffering needlessly because this research is being blocked by a minority of people that think the very same way you do, the current president, and possible VP included.
You simply can't overlook the qualitative differences and epistimological fallacies concerning the argument you have proposed here.