You don’t know why Buddhist monks would be expected to behave differently?
Not really, again under independence from external government control the monks quickly organized a brutal fuedal system holding most the non-monks in serfdom, I don't know why their brutality would change post cold war.
And again I'm not singling out monks in particular, lots of non-buddhists did that too as did the Chinese that conquered them just under a more intellectually polished reasoning.