Why did Aryans not mention the place of their origin?

Is writing history so difficult that Aryans - who produced the best of books on maths, sciences, literature,  linguistics, aesthetics etc- didn't know how to mention the place of their origin?

Finally it became the duty of Christian missionaries and British colonizers to locate their place of origin outside India!

How could Nehru and historians patronized by his dynasty not follow in the footsteps of their colonial masters?

But archaeology and genetics disapprove of the Aryan Invasion Theory invented by the fraudsters of the 18th century. Thapars, Habibs, Sharmas et al are just HMVs who need to be ignored. Their patrons decided their research results much before the start of the actual research!

PS: Generally you don't mention the place of your origin when you and your audience are not from outside. But such common sense can't be accepted by the high-profile eminent historians. So if you don't mention the place of your origin, you are deemed to have come from outside!