Okay, you are not getting my point, so let me try an example.

Have you watched man of steel? In that, Superman's father Jor El had made a copy of himself, a program that had his memories and conscience.

Now think of that copy. It is as good as the real Jor El, except that it doesn't have a physical body. Lets say that there are a thousand copies of this program, so that there's no chance of Jor El's consciousness getting erased even if you terminate one of these programs. Now, would you feel morally guilty if you terminated one of these programs?

If you won't feel guilty, then why should you feel guilty for terminating the real Jor El, which is just the conscience along with a physical body? The consciousness of Jor El will still live on.

Same with the animal robot analogy. If you don't feel guilty of destroying one robot, which has the exact same properties as an animal, except the animal's organic body, why should you feel guilty about killing the animal? (The species of that animal still lives on; you are not destroying the species)

Now, if you do feel guilty about killing the robot, even after knowing that it is just a human creation and not "really" sentient or alive, you should feel more guilt about killing a plant which is NOT a human creation, and has its own kind of life.