Part of it could be how quick the Catholic Church is to sever ties with hospitals that perform abortions. That's a lot of funding to lose. I'm not saying it's right at all, and I'm not saying it's okay in anyway, but that could be a reason why the church affiliated ones don't perform them.
That could be a huge part of it, actually. Thanks. God damn, that institution never ceases to irk me, sometimes disgust me.