It actually occurs even among the married couples but just as you said it's a very rare case. I have witnessed few of such cases in the past where married women mistakenly took in while they had an infant still breastfeeding or due to some personal reasons. These cases is not rampant as it is among young girls and boys mingling together in the name of dating and love. Nevertheless, abortion is same as committing murder whether being done at the early stage of the pregnancy or at the late period. It's killing of a life and it is punishable.
It doesn't matter whether the pregnancy comes following the right process or illegal process, God has his reason for granting you the pregnancy and should be protected by whatever means until delivery. Doing abortion could transcribe to two things; killing the child which is a gift from the above and Secondly, you risk your own life in the process which might lead to death. The rule is very simple, keep the pregnancy or stay away from having it in the first place if you can't keep it.
First of all, I don't think abortion is an art. I highly doubt that people who decide to commit abortion are happy with this decision. Life isn't the same for all of us. Same as our beliefs. You're both basing it on your belief that the god you worship or your religion, doesn't allow abortion. Not everyone believes in this god, though or has the same religion as you.
Personally, I also think that once a life is conceived, even at it's most base level, it's worth giving it a chance to be born. But there are people who didn't want to have a child in the first place. Victims of rape, unplanned pregnancies, or whatever reasons, I think, should be allowed to decide whether they want to proceed or not.
The problem here is that since in many places it's taboo to have an abortion, a lot of these people who decide not to continue with their pregnancies resort to unreliable processes by ineligible doctors or non-medical persons. This is where it becomes dangerous to mothers. That's why I think it's important that if in case they do decide to get an abortion, they can go to actual medical practitioners licensed to safely help them out.