My issue with those anti-abortion is an inconsistency with most of their views. The best argument I've heard against abortion (and as to why murder is morally wrong) is VOAFLO - Value of a Future (like ours). The general argument is that murder denies a future, which makes it morally wrong. As abortion also does this, it is also morally wrong.
But even this argument breaks down at the issue of contraception, almost every abortion argument I've heard does.
If you are anti-abortion, logically for the same reasons that you oppose killing a fetus you should be morally obligated to oppose birth control. While a few people are, most are not. When confronted with this most tend to make the "heartbeat" argument, which doesn't fly, as merely having a heart doesn't make someone human.
The argument against the murder of children unborn goes like this:
It's not a "mass of cells", it's a HUMAN mass of cells, just like, a little later on, it's human mass of cells that weighs three kilos and can be released from the hospital.
Murder is morally wrong for one reason and one reason only: The murder victim isn't the property of the murderer, because no human can be the property of another, and the act of murder is a theft of life, an act of vandalism, as it were, since the murderer cannot keep the life for his own use or resale. Mayor Snorkum digresses.
Yep, most "contraception" procedures are actually contra-implantation methods, and hence no more moral than Jeffrey Dahmer. The concept of "out of sight, out of mind" comes into play to sway people who want something for nothing, in this case morals-free sex.
Also, the phrase 'birth control' is inaccurate since birth control presumes that the birth is going to happen. But whatever. True contraception involves keeping those eager sperms away from that drifting egg. These methods range from spermaticides to diaphragms to condoms to doing something else to let the sperm out, but not in the egg's playground. Monica was an excellent example of effective contraception. Who would have thought that a cigar could prevent her from getting pregnant, eh?
But, finally, there's that word "no". That's the most effective contraceptive of all.