Stem-cell research has the potential to save lives. Of course there is no better organism with which to experiment than a human being, but this does not validate it. The ends do not justify the means, lest we should have to re-evaluate the actions of "Dr. Auschwitz," Josef Mengele.
Let's not re-evaluate him. Let's call him a murderer. Let's not use human beings as unwilling participants in medical experimentation.
But embryos are not people, some might say. They have human DNA, so what else are they? They're not Martians. They're not turtles. They're humans who cannot scream; humans who cannot survive to relate the horrible ordeal. That's why it's so easy to kill them.
Don't tell sob stories about those afflicted by disorders that might be cured by stem cell research. Sob stories are irrelevant. They are ad miseracordiam. The issue is, should some humans be killed intentionally and undeservedly (i.e. murdered) in order to save others possibly.
If the government has any authority, it is only to protect the human rights to life, liberty, and the ownership of property. Embryos are human, embryos live, and they have the right to live.