For any woman having an abortion is a serious decision that she will only do if she has something quite important at stake. Whereas people who are prepared to go into the supermarket and buy some ham don’t need to do that at all. They could easily eat something else. They are supporting the pain that is inflicted on those animals during their factory-farmed lives in the process of slaughter for a very trivial reason. So they certainly shouldn’t be looking askance at women who have terminated their pregnancy for much more serious reasons. At least not on the grounds of pain that might be inflicted on the foetus.
This quote is from Peter Singer in a conversation with Richard Dawkins: