I agree that there must be some reason(s) that motivates them beyond common understanding.
1. The promise of truly "free sex" can only be realized when procreation can be positively short circuited, i.e. through baby killing.
2. Money is a big motivator for the baby killing industry, but the numbers of those who owe their income to this grizzly practice does not explain the level of political influence.
3. Those in the population control circles in world politics probably fantasize about unspoiled by so many human beings. Killing people is unpopular. Granting women the "right" to kill her own children spins better and is far less visible means of controlling population.
4. Macro economic issues tie into the motivations for abortion in some ways I don't fully understand. In the short term, you can get a bump in productivity if less of it is spent on raising children. Any fool can see the down side of the policy long term. The department of labor has forecast major labor shortfalls in a couple of decades. I contend that a main brake on our economic growth is our low birth rate. I also believe that most of the social security shortage can largely be explained by a womans "right" to kill.
They don't want to be associated with the "mean and uptight" Republicans who remind them of their fathers.
It is really that simple sometimes. Most women are social creatures ,and so desperately want to "fit in" that they will follow whatever the "cool girl" does.
If the "cool girl" has a Right to choose " agenda, many women will follow without thinking about it much.