Well I'll weigh in on this one. I think if this is being presented to you if you bring up all the aspects of violence in the natural world it will inevitably bring about the scripture where the Lion lays with the Lamb. That's basically the point of having this article is to get people to talk about the violence in the world so that they can say "Wouldn't you like to see a time where all this is corrected?" Then the dangling of the carrot begins. You could possibly refute this with "I understand the need for life and death in the world so that the Earth can handle the population on it, but I wish it wasn't done with such cruelty. The lion has sharp teeth that are specifically designed to tear flesh, claws which are specifically designed to latch on to a moving animal in order to debilitate it, Sharks have three rows of razor sharp teeth specifically designed to tear limbs off with the accuracy of a surgeon's scapel, tape worms are designed to devour all the nutrients needed to survive and keep the host in a constant state of semi-conciousness, Maggots are injected into a catepillar and eat their way out with such efficiency that they instinctively know to eat all the connective tissue first in order to keep their host alive long enough for them to develop fully. As I said I understand the need to keep population in check, but to do so with the methods that I have mentioned (and many more that I could) just shows a fetish for inflicting pain and suffering."
I'm thinking along the lines that the refutation would show that while these things are necessary in order for the Earth to continue to survive the horror of the way it's done cannot show anything but an un-loving creator. I would then ask if they know of any merciful way in which population growth is curbed.