I’m not sure we can attribute this inaction to much more than the established Democrats actually stand to personally benefit from these policies. They don’t really have a reason to push back because their donors are the same people in most cases (there are a few exceptions) and so many of them have the same level of gerrymandering and name recognition in their districts as the opposition.
This is not a statement that both parties are the same. They demonstratively are not as Democrats won’t typically be the ones to enact these policies but they also don’t really have a reason to stop them either since things like the tax breaks personally benefit them.
“‘The unborn’ are a convenient group of people to advocate for. They never make demands of you; they are morally uncomplicated, unlike the incarcerated, addicted, or the chronically poor; they don’t resent your condescension or complain that you are not politically correct; unlike widows, they don’t ask you to question patriarchy; unlike orphans, they don’t need money, education, or childcare; unlike aliens, they don’t bring all that racial, cultural, and religious baggage that you dislike; they allow you to feel good about yourself without any work at creating or maintaining relationships; and when they are born, you can forget about them, because they cease to be unborn. You can love the unborn and advocate for them without substantially challenging your own wealth, power, or privilege, without re-imagining social structures, apologizing, or making reparations to anyone. They are, in short, the perfect people to love if you want to claim you love Jesus, but actually dislike people who breathe. Prisoners? Immigrants? The sick? The poor? Widows? Orphans? All the groups that are specifically mentioned in the Bible? They all get thrown under the bus for the unborn.”
~David Barnhart
The only reason pro choice exists is because the republican party found the perfect groups to advocate for and against. It makes their constituents feel all warm and fuzzy to say they’re pro life, while they’re given an equally convenient group to hate. Trans people make up just slightly less than one percent of the US population and the odds of one of their constituents will actually meet a trans person are significantly lower than them meeting that nice middle class gay/black Christian protestant couple who sometimes invites them over for supper after church on Sundays.