If all famines caused by economic systems are genocides, then there's a very large reckoning to be done by applying the same accounting methodology to other countries.
If you add them up in the last century, you'll see that Communist and similar regimes dominate the famine stats.
Much of it was dysfunctional economics, but much was also deliberate genocides of disposable populations.
I always got the sense that Mao's genocides are more visceral in the West because of the large Chinese immigrant population that lives in the US.