I take issue with that statement: “viable” means it’s capable of growth under favorable conditions (do a google search for “define: viable” and nearly every entry says the same thing). “Unviable” would then mean it’s incapable of growth. We do kill unviable tissues (for instance, my mom had an egg that got stuck in the tube near the ovary; had she not aborted it, it would have killed them both). However, we also regularly kill viable tissue (my friend’s ex-girlfriend got an abortion because she didn’t know who the dad was and didn’t want to have so-and-so’s kid–had she not gotten the abortion, the “tissue” would have been perfectly capable of forming into a healthy, human child).

Maybe it’s just a wording issue, but you’re wrong, so I feel obligated to point out the error before you “lose” an argument over semantics.

Cheers!