My humble answer is: I believe that many have contributed to this unfortunate situation; nevertheless, the major culprit, I believe is the U.S. Congress, for failing to fulfill its duty to act when action is needed to hold the Supreme Court accountable for doing what Congres was designed to do: Creating new laws. Activist judges are constantly creating new laws our of thin air. A good example is the legalization of abortion, which cannot be justified under the U.S. Constitution.
The notion that privacy can be more sacred than the life of the unborn is a dangerous myth. It has caused the death of 45 million unborn babies. Now a social security crisis is looming on the horizon, since an entire generation [45 million] are missing from the pool of young workers, and the constant inflow of both legal and illegal immigrants is a rather poor altenative to the shortage.
Europe is facing a similar crisis. The birthrate per woman is way below replacement level. This situation is rather serious in nations like Russia, Italy, Germany, and Japan. Some countries are already considering legislation to encourage pregnant women to carry their pregnancy to term, with financial incentives for them to do so.