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There is generally no malice in abortion, although there is often selfishness, irresponsibility, and disregard for the value of another life. However, the motives may not be malicious, but the results are the same.

Then it is not murder in the first degree, if there is no malice in abortion.

Genesis 1:26-31 - 26 And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth. 27 So God created man in his own image, in the image of God created he him; male and female created he them. 28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth upon the earth. 29 And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth, and every tree, in the which is the fruit of a tree yielding seed; to you it shall be for meat. 30 And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat: and it was so. 31 And God saw every thing that he had made, and, behold, it was very good. And the evening and the morning were the sixth day.

The atheist view makes as much sense as believing in God, Jesus, the saints, pagan gods, that aliens from Planet X beamed you away for research while you slept, etc, etc. Try having an open mind or at least respect for other people's beliefs, because there is a big difference between believing they're wrong and saying they're wrong.

As you know, I feel no guilt for saying what I believe.

So it's okay to be insulting to other people and their beliefs, because they don't agree with yours?

So we can kill to eat.

How else is the action of killing animals justified?

In the Old Testament, the Israelites were commanded to kill animals as a sacrifice.

Leviticus 1:1-5 - 1 And the LORD called unto Moses, and spake unto him out of the tabernacle of the congregation, saying, 2 Speak unto the children of Israel, and say unto them, If any man of you bring an offering unto the LORD, ye shall bring your offering of the cattle, even of the herd, and of the flock. 3 If his offering be a burnt sacrifice of the herd, let him offer a male without blemish: he shall offer it of his own voluntary will at the door of the tabernacle of the congregation before the LORD. 4 And he shall put his hand upon the head of the burnt offering; and it shall be accepted for him to make atonement for him. 5 And he shall kill the bullock before the LORD: and the priests, Aaron's sons, shall bring the blood, and sprinkle the blood round about upon the altar that is by the door of the tabernacle of the congregation.

Now, I do not believe that we are to be cruel and bloodthirsty in killing animals. But God made us superior to the animals (Genesis 1), and has allowed us to kill animals in some cases (Genesis 9), and has even commanded to kill animals in some cases (Leviticus), so it seems clear that there is no sin in killing an animal.