That doesn't change the fact that chopping somebody up is simply wrong.
Standing and watching while someone dies is pretty much as bad, though, and would be the equivalent action to just letting nature take its course. And hell, maybe it is the less immoral act, but even if it is the scale is
massively different. Doesn't mean you should stand aside as someone's chopping people up, but if you're trying to be even remotely consistent you should be a lot louder about the bigger problem (especially considering it's one that's significantly less of an ethical question, heh.).
You'd also note well a lot of vegetarians abstain from dairy products, heh. Which would be a closer equivalent, imo. Milk and beef is just a
titch more akin to each other than wheat and beef. It's not so much a matter of being a component as being a similar sort of thing, and the component parts in the case of a fertilized egg share a hell of a lot more with it than the egg shares with a developed fetus. If you're going to lump the egg in with the fetus, you should probably be lumping the egg's components in there, too.
... also, we could totally get parthenogenesis working if we'd just get off our asses and do it. That never is pretty conditional to the present, heh.
There's a slight difference between a deliberate abortion, and biology just spontaneously deciding that no this isn't going to happen, or gametes dying off in the testes because the fella isn't having sex literally all the time. If the former is murder, the latter is more akin to dying of disease, or in an accident, or of old age. Nobody is really at fault.
The gametes dying off in particular is more akin to someone in front of you starving to death -- a preventable event. You don't even
have to be constantly having sex, there, just preserving the material. There's a substantial amount of fault lying in the hands of people doing nothing while others die, particularly when they have a relatively straightforward way of helping. Watching as someone starves in front of you when you have food isn't exactly a blame free action.
And yeah, the extremis in the other direction is completely ridiculous, too.