It's pretty clear that Stalin used the famine to help liquidize non-Russian groups who had strong identites and had resisted collectivization. Ukrainians were #1 on this list. It's a textbook play.
Have you read it? It's very comprehensive. I would highly recommend you do so if you are at all interested in the subject.
What "non-biased" sources would you recommend?
It's also not very wild, from a historical point of view, for an authoritarian leader to destroy or decimate ethnic groups or communities. In fact, it's extremely common, as it is an effective way of consolidating power.