The point behind this is that your argument boils down to essentially “people still break laws, so why have laws?” That is a poor argument that isn’t going to convince anybody who believes that abortion is murder. Particularly if you are saying that the “murderers” in this case are just putting themselves at risk.
I say this as someone who agrees with you, that the best way reduce the number of abortions is to provide better sex education and access to birth control.
My mother has been an anti abortion activist for as long as I can remember, so I’m familiar with the thought process.