And that is not the only measure that Aeryon had did to change this world.
He abolish some draconian measures like boiling people alive as a method pf punishment. Aeryon is quite aware that many chiefs still retain this punishment.
Even in Khagai tribe and even in Duhai tribe, this punishment is very well alive.
There is some other punishment that would make people puke in disgust and fear when they hear it.
Aeryon knows he could only do this simple step. Fear and benevolence should be used sparingly.
A fearful soldier could do many things. But there is a limit to fear just like there is limits to benevolence.
Too much fear and you would raise a bunch of rabbits. Too much benevolence and you raise a lazy soldier.
Reward and punishment must be clear. Benefits and loss must be calculated.
Aeryon is not stupid enough to change the whole punishment.