Let’s examine what these things have in common: rape and incest exceptions to abortion, opposition to access to contraceptives, insistence on proven failed abstinence only education, and opposition to STD prevention methods like vaccines (HPV vaccine for instance)
You would think the one area where pro-life and pro-choice people would come together would be reducing the number of abortions by easy access to contraceptives, sex education, etc. Someone not getting pregnant in the first place is the best possible outcome - no abortion need be considered. Both sides should agree on that, right? Slam dunk.
But that’s not the case. The conservative/religious types generally oppose access to contraception and sex education that will lead to lower abortion rates.
Why? Because they view sex outside of marriage to be morally wrong, and they view having an unwanted kid as a consequence of unwanted sex. To get an abortion, in their view, is to skip out on the rightful consequences of your sinful behavior, unacceptable.
So, knowing this, the exception to rape and incest begins to make sense. If you were raped, it’s not your fault, you didn’t commit dirty premartial sex, so you don’t deserve the consequences. So you’re allowed to have an abortion.
This is, paradoxically, one situation in which the people with the more extreme view (no abortion no matter what) is actually the more consistent moral position. If your position is that abortion is wrong because it’s murder, it’s wrong whether the fetus comes from rape or not.
So the people who advocate for abortion only in the case of rape or incest seem like the more moderate and reasonable position to the average person, and yet their position is often more evil - they’re clearly viewing abortion as an unfair way of getting out of punishment for your dirty premarital sex, rather than the more noble view that life is sacred.
If you think I’m being too harsh to judge their motives, then explain why many of those same people oppose sex education, contraception, and things like HPV vaccines (STDs are also supposed to be a consequence of promiscuity - they would likely oppose an AIDS vaccine and do oppose sex education that lowers STD rates). If they truly wanted to prevent abortions, those would be the best way to go about doing so, to prevent anyone from needing an abortion in the first place, and yet they fight very hard against such things.
Because to them, it’s about the sex, and the punishment for the sex. Care for the life of the fetus is secondary, if there at all.