Rulers

Is there ever a common ruler to measure people for anything? 

Everyone is ultimately different, with different life stories, different ways of thought, different ways of expression? 

What is considered outrageous in one culture may be perfectly normal in another.

Where do we draw the lines?  Why do we draw the lines? 

Why do we not let kids draw outside of the lines?  

Is it because the majority of us are so dull that we want everyone else to be equally dull?