The law of kamma is like the law always at work, bypassing the cultural/social laws. A society built on ignorance will suffer one way or another, sooner or later, as we have plenty of examples in history. Because of cause and effect, certain immoral actions may be an “optimal strategy” for a mundane result. It’s much more efficient (sometimes) to kill a king and take over a throne rather than compete on the same footing.
https://franpritchett.com/00ambedkar/ambedkar_buddha/04_04.html#05_05 – Here some good information that may showcase insight on those matters