Your son's birth was planned, right? Or barring that, the two of you were in a loving relationship. Now, a woman who is raped, or even one who engages in premarital sex is not planning on having a child, they are simply doing it for the pleasure. A man, in our imperfect society, is quite capable of running away, never to be heard from again while the woman is left with the child, something she was not ready for. The emotional, financial, etc. burden, and I don't use burden in the negative sense, of having a child is emmense. If a woman is unprepared it can be devastating, meanwhile, the worst the man has to deal with is the possibility, and it's a very small possibility, of an arrest warrant, sure that's a big deal, but with over worked police forces, the warrant rarely gets issued, and even more rarely gets followed up on. So, the woman has to have the child, nine months of pregnancy can be extremely bad if it's on your own, and then they have to support the child, a financial responsibility that most women who get abortions can not make.
Was it a bad decision to have sex? Maybe, if there were a 100% effective form of birth control, besides abstinence, which to be honest is not an entirely reasonable suggestion, then I would agree, abortion should be outlawed, but until that day, women need someway out.
Cheers