You don't get it, do you? These good UP and Biharis are a very very small minority. And they don't have any trouble in Maharashtra or South.
I will give you an example. Almost all IAS,IAS,IPS and IRS officers in Maharahtra are bhayyas. Bhayyas from UP and Bihar prefer working in Maharashtra than in their own states. They have made billions by sucking every last drop of blood of poor Marathi locals. Look how children of these filthy and corrupt bhaiyas IAS officers drive around in mercedes and bmws while poor farmers are committing suicide in rural Maharashtra.