Jesus was silent about war. Jesus never forbade fornication. He did not have to, the law was already clear:

Matthew 5: 17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.

The issue you raise was argued about and settled early in the Church’s history. If you treat others as you would have them treat you, you have complied with the law. You would expect to face a defense if you attacked someone. That defense might end your life.

That "the fundamental right of men is life" does not justify the taking of life, but it does justify defense if the willed act is defense, not murder. Since the unborn can never will harm to another, it can never be the subject of self-defense.

I can make this clearer with some examples.