Let's take that logic to another issue. Just because some people abuse the right to abortion does not give cause to take away that right from others.
I am sure the 1st thing you will say is that the Constitution doesn't mention abortion, but there are many things covered by decisions that aren't there - think Citizens United (a complete travesty).
Abortion is not an "enshrined" right in the Constitution, it is a law that gives you the right to have a procedure done with certain caveats. Citizens United is no more a travesty than Public Employee Unions donating to their candidate of choice. Choice of the heads of the Unions; or the trial lawyers union. you have selective outrage.