Serious to the point of not knowing the author's meaning and suggesting it may be a naturalist's description of pitiless killing of the natural world.

But seriously, it's a weak riposte to the antis. Mine usually shuts them up. I tell them what I do and how I feel about what I do and make no apologies for it.

If that's not enough, to respect their feelings, I say think of me and my kind as dinosaurs that will be gone some day and you'll have the world to yourselves!