You mention a source: can you provide a cite or a link?
Persons who oppose birth control, who want to make it more difficult or expensive to acquire, must accept that they are promoting abortion in lieu of or even as a method of birth control. It reminds me of the hypocrisy of persons who oppose same sex marriage and then criticize homosexuals for supposedly unstable and unfaithful relationships.
You didn't answer my question.  Even if you were right that the leading cause of abortion is convenience: What strategy or policy does that suggest to you regarding a way to discourage or decrease abortions?
We have a militantly anti-life president who is advocating social, economic and health policies that promote sickness, death and abortion. How ought the  "pro-life" movement respond?