I don't think this change was due to any political views.
I guess Jackson just wanted to increase the role of Merry and Pippin, which is noble, especially because the two only served for comedic purposes until then. But at what cost. The changes make Treabeard look exceedingly stupid and the logic of the plot is lying in pieces. It was also about dumbing down, again. The influence that Merry and Pippin have on the Ents in the book seemingly isn't obvious enough.
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