Sholuldn't we Hindus discard false,fabricated,forged (Aryan-Dravida) race theory and be ONE RACE & ONE PEOPLE?

No educated person believes in the Arya/Dravida theory. That theory is no longer current, it is out dated. It is a false theory floated by the Britishers. They were ignorant. Mahabharata mentions princesses and princes from Gandhara (Kandahar today) being married to people from the Indian areas.