Pro-life people see fetuses as living babies. To them, letting people abort them is equivalent to letting parents strangle their kids if they decide they don't want to take care of them anymore, in other words, all kinds of messed up. There are many valid pro-choice arguments, but "it's not your business what other people do!" is really not one of them. Saying that kind of crap demonstrates absolute ignorance of what the other side is even saying.