What's wrong with the Thrive/Survive Theory of left and right

Source: EconLog
by Bryan Caplan

"Many big social issues that divide left and right in rich countries like the U.S. directly contradict Thrive/Survive. To take the most obvious case: unwanted pregnancies are much more burdensome — and legal abortion much more valuable — when life itself is insecure. The same goes for the traditional Christian teachings of unconditional love and unconditional forgiveness. If Scott were correct, rightists wouldn't just be pro-choice; they'd literally be pro-abortion for any fetus likely to burden society." (09/12/17)

http://econlog.econlib.org/archives/2017/09/whats_wrong_wit_23.html