Genocide, ethnocide or politicide?

Here's an review in the London Review of Books on two books (three if you count each volume of one of them) on the subject of genocide. Frankly I don't understand the whole article but in its discussion of the UN Convention on Genocide, I was drawn to this passage:

Feeling that nothing like the Holocaust should ever be allowed to happen again, the UN Convention on Genocide tried to define exactly what it was that had happened. The omission of political, occupational and other social groups from the terms of the UN Convention, which thereby excluded the mass killings of Stalin and Pol Pot, has been criticised by many. Michael Mann chooses to call such massacres ‘classicide’ or ‘politicide’, and reserves ‘genocide’ for the destruction of ethnic or religious groups. Mark Levene, on the other hand, includes all of these within his definition of genocide as ‘the state-organised total or partial extermination of perceived or actual communal groups’.

However, the Convention also inadvertently included within its definition many other things that none of the signatories regretted very much, like the colonial depopulation of Australia and the Americas. Mann prefers the term ‘ethnocide’ for the unintended annihilation of racial groups, but for both victims and perpetrators the consequences are much the same. Without the benefit of such ethnocides many readers of the LRB would not be living where they are now. Few think of themselves as being in favour of genocide, and many would like to see Israelis dismantle their settlements on the West Bank, but no one is going to demolish their own house and give the land back to the indigenous people. Zionists remember this, and so did Hitler.

See what you make of the whole thing here or here.