My theory! 
The shoe is the scourge of our society.
I posted a similar post on steepshot but i am afraid that nearly nobodyreads the text there
The shoe is the border between us as a human and mother earth. It loses and disconnects us from nature.
If nobody would wear shoes, we would care much more about our planet and the environment. It would be impossible to find rubbish glass, oil or other disgusting stuff on the floor. Just simply because nobody wants to step on it.
Walking barefoot is much healthier for us. Our society would not be bothered with back or knee pain.
We would make our pavements out of a material like mulch or grass, which is nice to walk on and which does not seel the ground. So that the rainwater can reach the groundwater.
We would not have to worry about the new trendy design and could spend our time on much more important things like family, friends or just living.
The rubbish mountains we produce would be much smaller in general and just think about all the money and resources we could save by not buying the stupid kicks.
For more to come @experimentel