Please elaborate.
In an abortion, a woman has violence done to her (even if she solicits and pays for it) a child is tortured and killed in the act of the abortion. So before the law intervenes violence is done to two people. Therefore the woman does not suffer alone. If we have a law with penalties and only the woman faces sanctions then you might argue that she suffers alone with respect to the operation of law. Thus, almost anyone who is pro-life would like to see legal sanctions against the provider. Is this what you mean in saying that everyone agrees that the woman should not suffer alone (I assume you meant suffering with respect to legal consequences), I agree. In other crimes where there are two active lawbreakers (e.g., drug dealer and drug purchaser) it is not considered immoral or cruel that both parties face some kind of legal penalty. The penalty need not be equal for the two parties. Laws can recognize different levels of culpability in the illegal act and have differing penalties based on degree of culpability.
I just have a rule of law problem if we reach a point where abortion becomes illegal and the provider faces legal sanctions but the customer does not.