I really don't think the argument that "if we make x illegal, then doing x will become more dangerous" holds much water. If we decide that abortions are wrong or immoral and decide to make it illegal, then people who get illegal abortions do so at their own peril. I'm sure illegal abortions are very dangerous. But I mean, they're also illegal. If we made that the law, then we're telling people "don't get abortions. we don't approve of them, and trying to get one is a bad idea."
We make it illegal to sell organs, and because it's illegal, I'm sure it's a much more dangerous undertaking than it otherwise would be.