That is like saying how does murder increase crime. Are you that ignorant?
Under current law, like it or not, abortion is not a crime. Murder is. One million abortions could be performed without a single crime being committed. One million murders would equal one million crimes.
Russ asks the kind of question I think everyone should ask, and I wish more liberals in particular would ask; What is the specific hypothesis and what is the evidence? Then, be open to what the evidence (or data) says.
Very fair question, Russ. The answer may be in the book, which sounds like it would be worth reading. I would like to see how he analyzed for this, myself.