Shutting others out=imprisoning ourselves

The whole drama being enacted by the Shiv Sena about Mumbai belonging to the Marathi manoos is going overboard! The only thing I don't understand is how come people take pride in parading their stupidity, that too so 'bravely'? The more dividing lines we draw, the greater we imprison ourselves. The Shiv Sena fails to realise that the walls they build to keep non-Marathas out of Mumbai are the very walls that will imprison them and shut them out of the rest of the world!