Because they already were halfway there. The one in the current chapter would have lashed out any time soon. The one before was a sociopath and narcicist, if not for kyou he would have had a similar reaction later. He only needed a push.
Tbf, the old noble armies instantly grasping and deplying a macedonian phalanx on the battlefield was plain bullshit, that formation needs some serious drilling of the soldiers to work.
The pike mounted bardiches were also nonsense, that'd be too much weight for the shaft and thus would break...
Rather: Classic "I have no reading comprehension".
Where do you see a "tragic past"? The flashback outright ends with him making friends with who he thinks to himself as the devil.
The flashback showed that he never could control his temper and that his new best friend made sure he could lash...
Exactly, that way it can raise armies in such a way that no region gets depleted of manpower. Thus negating the economic burdens of large casualties for each region.
Qin becomes an army with a state, so to say.
Genocide is always a "mass" thing. Either use "mass murder" or "genocide". Mass genocide makes no sense.
In her case, it is genocide. Which already is the ultimate crime against a population.