@Advocate,
The very site that you posted from about the atrocities in Guatemala also talks about what they see as atrocities committed by Israel against the Palestinians. According to your own source they are similar examples of a militarily powerful force against an indigenous population. They refer to Israel as an Apartheid state committing ethnic cleansing against international law.
These two situations deal with the same issues. And you are taking rather contradictory positions in these two cases.