I would be the first conservative to cut a fellow conservative some slack. But Goldwater never cut anyone any slack. As Feder's piece says, Goldwater was a bitter man to the very end. The basic principle of a right to life for all human beings, trumps the concept of "life, liberty and the pursuit of happiness". When Barry Goldwater began lending his support to Roe v Wade, he ceased to be a "true" conservative.
Here's some more reading material on Goldwater and abortion rights. Link to "Barry Goldwater: Champion of Liberty, But for Whom?"