Raze = high unrest

[Wizzington]

Razing does not kill 70% of the male population. It was not possible for a horde to kill that many people. Even a modern state would have trouble with it.

 

[Wizzington]

Such death figures are from famine and the like, which tends to coincidence with unrest and revolts. The 'they won't revolt because everyone is dead' argument is quite poor.

 

[Wizzington]

https://en.wikipedia.org/wiki/Paraguayan_War - and it's not even a modern state. According to some data 90% of adult male population died.
Somehow I can imagine Mongol Hordes killing 70% of people - that was a usual strategy of Timur when an surrender wasn't agreed beforehand.

90% of the population was not directly killed by invading armies, and it happened over a period of six years. It likely also includes people who didn't actually die but rather just fled the country, 19th century census methodology was hardly perfect.