Originally Posted by Gunhaver
Predation is the big one for me. Life eats itself. That's just how it works and it's so damn indifferent that it would be beautiful if it weren't so damn horrible. Countless trillions of organisms that are very capable of suffering and feeling pain have been snatched up, bitten to pieces, chewed alive, torn apart and injected with venom that incapacitates by sheer pain all for a meal for something else. Young life is often preferred as it's easier to catch and less dangerous to take down. Babies are essentially nature's delicacy.
Even more so when you consider that the only way for it to be possible for life to exist in any sort of complex and abundant way is for it to be utterly horrid in this manner. Life consuming other life is what gives it the efficiency needed to develop more complicated life forms (like us). If it weren't for the kill or be killed nature of life it would have never gotten past the stage of single celled photosynthetic bacteria relying on the sun for energy input. No insects, no fish, no mammals, just a bunch of algea growing on the sunny side of a wet rock.
But instead, something came along with an adaptation that allowed it to consume other organisms. This gave it an advantage that allowed it access to more energy (by consuming others). Then another adaptation, and another, and another. Until, finally, you have mammals like us at the top of the food chain with big enough brains to actually consider the relevance of this; Without the horrid nature of life eating life then there would never have been an instance where enough energy was concentrated in one place to develop a thinking mind.