One might respect the integrity of their views if they were consistent about the sanctity of life. But in reality most of the anti-abortion zealots show indifference to human life in other contexts; eg they are generally opposed to gun laws, anti-poverty programs and Covid measures and in favour of capital punishment.
This article suggests that the obsession of white protestant evangelicals in the US with abortion is a relatively recent construct of the post-1970s. Prior to that they were relatively unconcerned with abortion and interested mainly in defending racial segregation.
https://www.politico.com/news/magazi...1970s-00031480
There is a parallel here with the rise of gun rights zealotry. Up until the 1970s the NRA was a pragmatic organisation that accepted the need for reasonable gun controls. In both cases fundamentalism seems to have been cultivated for political gain.