because murdering another human is not taking any kind of personal responsibility for your actions.
In other words, despite the fact that you go on and on about personal responsibility, it's really about the killing of human fetuses. There are a lot of bad arguments on both sides of the abortion debate, and the humanity of a fetus is your best one. Personal responsibility is not a good argument because that would never trump murder, and if abortion is not murder it would not follow that having a child is necessary personal responsibility for a pregnancy.
The subtext of the personal responsibility argument is clear and whenever people bring it up, one cannot help but understand that subtext. When you say personal responsibility you are ascribing moral value to sex. Unfortunately there is none, and historically the link between sex and morality is meant to control female sexuality, that grand mystery you all want to possess and so jealously oppress.