Nobody is doing any favour to MUMBAI. the one who are there and the one who are coming into mumbai ,, all are for themself only. let it be marathi, sindhi, punjabi, tamils etc etc. etc - ALL are for themself.
It is only mumbai , which is giving and accepting everybody.
So everybody who want to live in Mumbai, must give importance to mumbai and dont do any act which defame the culture and peaceful living.