Because that's a thing it can do. It's properties include self-interference. You are building your expectations of 'what a thing can do' based on the macro wor

Because that's a thing it can do. It's properties include self-interference. You are building your expectations of 'what a thing can do' based on the macro world you live in and the things you see and experience 'up here'. But down there, the rules are simply different. Our expectations and intuition are simply not evolved to handle situations that occur in that level of reality. We've never thrown a rock and watched it self-interfere. But we should throw a lot of doubt at anyone who claims that it's all very natural to them, imho.