In Borneo men of certain tribe may suddenly and without reason punish or even beat up thei wife. Also they may feel enmity towards their neighbor,again suddenly and for no reason. Why does this happen?
If you have some evidence then please share it. In the Dayak society men and women possess equal rights in status and property ownership.
I imagine if this is the case, then any domestic violence and neighbour-hating is done for the same inexcusable reasons it is done in many societies across the globe.
Perhaps it is a frustrating reaction to the invasion of modern Men upon their ethnic way of life. Pressure to conform to modern ways in favour of customary practices has to be quite dramatic for them. Even nowadays, daily headhunting is still practiced amongst the more remote tribes.