I think it's entirely possible to support someone's decision to have an abortion, while wishing that it were not necessary for them to make that decision. I've never had an abortion, but I don't imagine that it's a fun or easy thing. I will always fully support any friend who decides to have an abortion, but I will also always wish that they hadn't had to experience it.Does that make sense?

To me, that *is* being fully supportive. It becomes non-supportive only when someone says "I support your decision to have an abortion", and then tries to talk you out of it/expresses disapproval or disappointment etc.