Isn't Abortion Purely a Personal Choice?

Well yeah.  If you destroy (a) packet of sunflower seeds your showing no regard for the sunflower seeds 

Not necessarily. You may have very high regard for the sunflower seeds in that you care enough for them to know that if you plant them, you will not have the inclination to propagate them, you would constantly deprive them of water and nutrients, brush them aside because they get in your way in the garden and let them wither.

Then of course, you may be keen to do some gardening, carefully place the seeds between tissues and moisten only to find that they are dud seeds and are mutating and rotting as they sprout, so you will throw them out and try again.

Then again you may have accidentally got the packet of seeds wet then realised just a few days later that they start germinating and think, Geeziz, I have nowhere to grow them and I don't want sunflowers growing right now, so you will throw them out.

As for me, if I accidentally get a packet of my wife's seeds wet (that she carelessly left open on the shed shelf) and one germinates then I would feel exicited even though we have a massive crop of sunflowers, we would both raise and nurture that sunflower with tender loving care. But that's just us though and what people do with their sunflower seeds is their business, especially the owner of those seeds.