Just like the better researchable Assyrians the Neo-Babylonians employed this as a proven tool to assert their control of the conquered lands and the remaining people there.   
Once the head of the snake is removed, it is no longer needed to crush that head?


The assyrian policy of deportation is analyzed as 


> 1. punishment for rebellious behaviour; 
>2. liquidation of competing powers and weakening of potential centres of resistance; 
>3. formation of a layer of loyal subjects; 
>4. production of a homogeneous "Assyrian" territory; 
>5. acquisition of labour; 
>6. expansion of cultivated areas.
>
> — Markus Philip Zehnder: "Umgang Mit Fremden in Israel Und Assyrien: Ein Beitrag Zur Anthropologie Des 'fremden' Im Licht Antiker Quellen" (Beitrage Zur Wissenschaft Vom Alten Und Neuen Testament), Kohlhammer: Stuttgart, 2005. (p121–123)

And the main point for the Babylonians remained:

> As a political policy, the exile of leaders to distant locations was designed to weaken resistance in the colonies.   
> — PCB, p71. 

That the Neo-Babylonians were less radical in using this method compared to the Assyrians is self-evident: Israel disappeared into ten lost tribes, but Judah remained somewhat more 'unbroken' in terms of (material) culture and the majority of people living there. 

For comparison, Sargon boasted in his records that he had deported 27280 Samarians and destroyed the entire House of Omri. (Attested in this number range multiple times, eg (TUAT I/4, 378, 382, 383, 384, 385, 386, 387))

Whereas the bible itself says about the Babylonian deportation toll:

> 14 He carried all Jerusalem into exile: all the officers and fighting men, and all the skilled workers and artisans—a total of ten thousand. Only the poorest people of the land were left. ([2 Kings 24:14, NIV][1])

Of course, compare that with the number given in  Jer 52,28: 3023! 


That the Neo-Babylonians ended up deporting 'quite a lot' of Judahites in the end was the result of continuous resistance, rebellion and uprisings in the land, often in cahoots with other local powers, like the Egyptians. Something any strategic thinker would have wanted to minimize. So each time there was a rebellion put down, more people were removed from the troubled region. Better safe than sorry? This occurred in 597, 587 and 582 BCE.

— "Judah under the Neo-Babylonian Empire." in: Israel and Empire: A Postcolonial History of Israel and Early Judaism. Leo G. Perdue, Warren Carter and Coleman A. Baker, (eds [PCB]). London: Bloomsbury T&T Clark, 2015. p69–106. [doi][2]

— Hans M. Barstad: "Way in the Wilderness. The Babylonian Captivity of the Book of Isaiah The Myth of the Empty Land. History and the Hebrew Bible", Dissertation, The University of Edinburgh, 2010.


  [1]: https://www.biblegateway.com/passage/?search=2%20Kings%2024%3A14&version=NIV
  [2]: http://%20dx.doi.org/10.5040/9780567669797.ch-003