Bush science policies hurt U.S. Loss of top geneticists is latest toll from religious corruption
I think the phrase "Religious Corruption" hits the nail right on the head. You can read more about it from PZ. I'll just give you the last paragraph here,
The United States is accustomed to being the beneficiary of brain drains, but in the biological sciences that has now been reversed because of the unreasonable restrictions imposed on the use of embryonic stem cells for research. The irony in this is staggering: To prevent researchers from using surplus embryos from fertility clinics -- already slated for destruction -- opponents will forgo willingly the promise of cures for cancers and assorted other diseases that afflict millions of human beings. There are ethical considerations in this research, but they can easily be answered, if opponents were willing to engage in a dialogue. But they're not; despite their self-identification as "prolife," they'd rather see the stem cells in surplus embryos killed than kept alive and used in scientific research that might help heal people in the future.