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I have to agree a bit.
Here is my scenario.
Palin family is falling apart since Mom became obsessed with her political career. Hubby threatens to leave, but she hangs on to him, and although there has been no sex for a good while, it happens this time and there is no contraception and by sheer bad luck she is pregnant and to make things worse, the fetus has Down syndrome.
Mom is highly pro-life. We don't know why. Maybe she had some experience with abortion in her past.
My sister is a physician and for many years ran a birth control clinic. She became accidentally pregnant and considered abortion, but didn't. Now she is strongly anti-abortion because she realises she nearly lost a wonderful daughter. This may not make a lot of sense, but that is how real-life people are. Maybe something similar with Palin.
Meanwhile daughter is equally pissed off with mom's obsession with politics and deliberately gets knocked up for attention.
As stated, these far right wingers are so screwed up that their attempts to regulate others are often suppressed attempts at self regulation of what they fear the most.
Probably the enthusiasm for killing animals is equally an attempt to keep her hunter-fisher husband interested and she would really prefer to be keeping a tank full of goldfish babies, as my wife is.