Why not? If you don't think that a fetus is a human life deserving of protection, then I disagree with you but at least your arguments would make sense. It sounds to me, however, that you are just throwing out relatively meaningless statements that you have been spoon-fed.
What other kinds of issues don't belong in politics? If abortion was currently illegal, would you chide pro-abortion people by telling them that the issue "does not belong in politics"?
Even if what you are saying about the streams of busses to canada is true (which I doubt), is that in and of itself a reason not to make it illegal?
Right now, there are 10's of thousands of American men who stream to Thailand and Cuba for the sex trade. Does that mean we should make the sex trade legal here since they are going to stream overseas anyway? Does it mean that the issue "does not belong in politics of the criminal justice system"?