There are no accident every things has a reason to occur. I agree that some thing can be destructive as well constructive, it is called principle of duality.However, it is not the darkness which destroy the light but the light which destroy the light. Someone would call it chapel perilous.
I will assume the question is asking about a 'ultimate' purpose, lead by some predestined fate or the hand of a higher being. Otherwise, yes is the only answer because the obvious idea of cause and effect. I don't believe in a higher being, or some undeniable fate. Miracles and tragedies happen without some spiritual factors interfering.