Why is "Don't be a dick" so hard to codify?
All these religions, ethics and philosophical systems, and all this technology, convenience and comforts.. and we still have so much friction in interacting with others of our own species.
The best solution we seem to have found is leaving each other alone.
I've come to believe that true maturity is the realization that everyone is capable of feeling the same things you feel.
But most of us – me included – seem to have "Single Player Syndrome" where we feel that we are the only person capable of feeling what we feel, and everyone else is an NPC with diluted senses and processing capabilities.