You have all mostly sidestepped the concept of 'Emergent Behaviour' - the intellectual counter to the 'Watchmaker' theory.
Read "Escher, Godel & Bach - an Eternal Golden Braid"
by Douglas Hoffstedder - Pulitzer Prize winning book
for an explanation (among many other things) about emergent behaviour.
Briefly, when chatting to his Computing Geek friends complaining about certain Computer multitasking Timesharing OSes only being able to accept a certain number of users before bogging down and becoming too slow to use...
"The critical number of users is 5"
"So why don't you go inside the OS and edit the number?"