You've made some excellent points here. First off, liberals usually like people to be informed- except when it comes to abortion. Abortion savages like those at Planned Parenthood? An ignorant woman is what they want- ignorant about the stage of development of their baby, ignorant about adoption, ignorant about anything that gets in the way of that baby being slaughtered and PP cashing in on it. Rest assured if we were talking about a tumor, liberals would be demanding doctors tell them everything they can about it so the woman can make an informed decision. Of course, abortion is not exceptional to liberals in just this way. It's the only invasive medical procedure I know of that doesn't require parental permission and sometimes not even notification. Amazing.
Of course, I would defund Planned Parenthood and any other bloodthirsty abortion savage group immediately. After all, we have Obamacare now, right? Birth control is free! But no, let's face it. This is big business. And like many big businesses, the baby killing businesses want their government subsidies.
Now... why set a limit? Because some limit should be set. And I don't think it's ever OK to kill the smallest. I think a viable fetus is a reasonable place to draw a line in the sand. I am against many things that I don't support a ban for, so abortion is not unique in that way.