It's just how religions works, they need an enemy to go against. Rituals to make you think that you are actually doing something.
Homosexuals, pork, masturbation, freedom of speech, smart people who asks questions, different religions, shrimps... that's just few of many irrational issues that religions have.
Your very premise is flawed, since no one is "pro-abortion", whatever you say.
Male masturbation is barbaric. It destroys a potential life. It is morally wrong. We both agree on these three statements. But--and I do not now how many times I have to say this-- it is a justified homicide. Understand?