There was famine in China from natural causes
From: https://en.m.wikipedia.org/wiki/Great_Chinese_Famine
It is widely regarded as the deadliest famine and one of the greatest man-made disasters in human history
(Emphasis mine.)
Also, regardless of the reason my other points stand: having millions of poor people starve to death will reduce you incarceration rate, and people might choose to live in a country with a higher incarceration rate if it means they don't starve to death.