You've created a lovely strawman and torn him down quite nicely. People do not "just decide" to get second- and third-trimester abortions; aborting a pregnancy after the first trimester is very dangerous to the mother, and third-trimester abortions are normally only done in situations where carrying the baby to term is almost certain to kill the mother.
Abortion as a means of birth control is not a choice I would ever personally advocate to a friend or partner, but it's also none of my business (or yours) what a woman chooses to do with her body. You don't like it, fine, but don't make disingenuous and fallacious arguments in support of your point while condemning the same in other people. That's hypocrisy of the worst kind.