I'll say as much that I wholly agree that unjustified or unnecessarily killing / taking life is bad, or in your word, repugnant. What justifies or necessitates killing is a matter for another day; it's a surprisingly nuanced topic.
Discussion
Yes, nuanced -- i believe that that is the right way to look at it. I suspect that unnecessary routine or industrialized killing inures us, not only to the drama and seriousness of ending a life, making us more likely to become brutal and ignoble in general, but also blurs our vision of the act to the point where we can't see when it really is justified or necessary.
To give one little example: I love Nature, and go out of way not to kill any animal, including insects. I hate poisons, and do not use them in my home. But if a swarm of bees were attacking my child I would kill them all -- and my conscience would still rest easy, and my kindness to all animals would continue unchanged.
And, further: If, say, some kind of alien creature arrived here that could mate with us and produce fertile offspring, and there was a real danger that such matings would result in our permanent replacement or hybridization, and the disappearance of our kind, then I -- who hates nearly all killing, far more than the average person -- would say that a time for extreme nuance had arrived.