It's called pruning. It is part of normal maintenance for olive groves.
All this crap about "settlers" and "destruction" is LIES.
Same reason why American settlers pushed/destroyed Indian tribes, or Poles took German lands or Germans tried to do this earlier to Poles and others, why Albanian Muslims are taking land from Serbs. Each time the invading side presents the losers in the worst possible light.
Both exploatation and the search for moral justification of it is in human nature. That is why an ancient Roman playwright Plautus wrote: "Homo homini lupus" (Man is a wolf to his fellow-man)