From a pro-choice publication on debating the abortion issue:
The [pro-life] opposition will hammer away at life and murder themes —matters of theology and faith, rather than fact and reason. Dispose of these as quickly as possible (avoid the “When does life begin?” discussion) …
Looseleaf workbook “Organizing for Action.” National Abortion Rights Action League, 1974, page 31. “Introduction to Debating.”
The evidence is overwhelming that life begins at conception, so it is not surprising that experienced pro-choice activists know they cannot win that debate.
