In the specific case of ...

In the specific case of abortion, the matter is particularly easy in that no woman wants a late abortion. Once abortion was made legal, the age of the aborted fetus went down. The slope slipped in the other direction. If we legalize RU-486 and other similar new drugs, the age will fall to one week or less and start approaching zero. The slippery slope will slide in the other direction. The only reason we have late abortions is because we make early abortion difficult.
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 Garrett Hardin

Quotes from the same author

The exquisite sight, sound, and smell of wilderness is many times more powerful if it is earned through physical achievement, if it comes at the end of a long and fatiguing trip for which vigorous good health is necessary. Practically speaking, this means that no one should be able to enter a wilderness by mechanical means.
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 Garrett Hardin
The greatest folly is to accept expert statements uncritically. At the very least, we should always seek another opinion.
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 Garrett Hardin
Numeracy: 1. The art of putting numbers to things, that is, assigning amounts to variables in order that practical decisions may be reach. 2. That aspect of education (beyond mere literacy) which takes account of quantitative aspects of reality.
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 Garrett Hardin
Economists (and others) who are satisfied with nature-free equations develop a dangerous hubris about the potency of our species
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 Garrett Hardin
Throughout history, human exploitation of the earth has produced this progression: colonize-destroy-move on.
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 Garrett Hardin